There are always some in the crowd that parrot something like what you are hearing. When they offer to buy my cars I might listen but until then I ignore them.
As others have said you need to decide what you want. The Boxster and a 911 model are quite different cars. Obviously if top down driving is important to you a Boxster is the way to go. While there is a Cab 911 it is not the same as the Boxster in this regard.
I actually owned both a Boxster and a 911 (966 Turbo) concurrently for a number of years. From when I bought the Turbo in June 2009 to Dec. 2017. (I bought the Boxster in Jan. 2002.)
I enjoyed both cars. Oh, I have to admit I never put the top down on the Boxster. (I never used the sun/moon roof of the Turbo either.)
They were to state the obvious quite different. However, inside they were also quite the same. I could switch cars without any problems.
Believe it or not I now own a Mini JCW and a Hellcat. When I switch cars -- I usually alternate between cars for my work commute -- I really have a problem with the differences in the controls: Wipers, lights, heater/AC, cruise control. Even the door handles are located in very different areas.
The fact the JCW is a manual and the Hellcat is an automatic also brings another problem. The Hellcat's automatic has me spoiled. More than once in the JCW I've rolled up to a stop and having to at the last second after I remember I'm not the Hellcat having to push in on the clutch pedal and shift to avoid stalling the engine. With the Hellcat even if I'm using the paddle shifters the transmission auto downshifts as I roll up to a stop.
Despite the HP difference: 217hp for the Boxster vs. 420hp for the Turbo; the Boxster was not a dog. Its 5-speed manual shifted very very fast and as a result during acceleration the quick shifts helped to make the Boxster feel faster.
The Boxster was a softer ride, but still has good suspension and road manners. The Boxster was a bit quieter too mainly due to the 17" wheels/tires vs. the 18" wheels/tires on the Turbo.
The Turbo was easier to get in and out of. The Boxster sat really low and sometimes even I had a bit of struggle when I had a sore leg or sore back. The occasional passenger was really taken back by how low the car was and often I watched as a passenger would just give up and drop the last few inches down to the seat.
The Turbo cabin didn't give some people a sensation of excessive closeness like the Boxster. The Boxster cabin put the driver and passenger *close* and some passengers were obviously a bit taken back by this. All passengers of course owned much larger vehicles and the Boxster was quite a different experience for them. But for the overwhelming majority of the time I spent in the Boxster I was alone and the small cabin was kind of nice. The heater/AC had an easy time of it -- the Boxster's auto climate control system was fantastic. I really miss that. The Turbo had the same system. While both my new cars have 'auto climate control" even dual zone controls, neither is on par with the systems in the Porsche.
The Boxster was the much better car to use around town. Easy to get in and out of driveways. The Turbo nose rubbed horribly entering/leaving driveways. Easy to maneuver.
However, the Boxster didn't give up anything on the highway. In fact it got better gas mileage over the same route -- 28mpg vs. 26mpg for the Turbo and I had to mind my manners in the Turbo get even get it up to 26mpg. The Boxster had more luggage space. The front trunk was huge. The Turbo with AWD had a small front trunk.
Even at higher elevations -- around 7700 feet outside of Flagstaff -- the Boxster had plenty of get up and go. It was a real GT car even though it had a soft top.
The Boxster was a much better car in the twisties. In some ways with less HP it was the more fun car to drive harder. With the Turbo on the same roads I always had a mental image of the Turbo rolled up in a ball of sheetmetal lying smoking at the bottom of one of the steep drop offs along the twisty roads. This muted my experience with the Turbo. With the Boxster I tossed it around like a go cart.
Both cars were very comfortable on long -- 4K+ mile -- road trips. I could spend 8 to 14 or more hours behind the wheel with nothing more than the occasional pit stop for fuel and to stretch my legs.
In the Turbo I had a better view out. The car sat higher and had more glass.
Of course the Turbo's running costs were higher. The Turbo cost more to fuel, insure, register, service, repair. Tire life was about the same as the Boxster's tire life but like everything else the Turbo tires cost more than Boxster tires.
Overall the Boxster matched up well to the Turbo or maybe vice versa. The Boxster was one sweet automobile.
However, if I bought another Porsche it would not be a Boxster. But it almost certainly would not be a 911 model either. For me the Cayman offers the substantial benefit of mid-engine location in a hard top (coupe) body style.