Advising someone looking for a smaller sized (wing) wingsuit, I'm not sure 'don't do it because others fly a bigger suit' is the best advice. Trends (like fast upsizing) mainly started because 'everyone else is doing it too'. There let your own comfort level and progression dictate what suit size you choose. Not (unintentional) peer pressure.
That said, I've flown with (and in) just about every suit on the market, and if you want to fly together, you can in any suit. But of course the bigger suits will need to always adapt downward to make that possible.
Mono-chamber is the new magic word, but in general, suits with a lower cell pressure (ease of pushing the air out, so you can close a wing during rolls/transitions easier) have been the norm in acro from the start (most wingsuits pre-2015ish had very low cell pressure standard). There its perhaps a bit re-inventing the wheel, after years of pushing for harder and harder inflation.
With regards to suit choice, a smaller suit doesnt always need to have a flocking purpose. I fly around 3/4 of the skydiving (and base) jumps I do in a big suit, but still grab the small suit often when learning something new, or doing creative 2 ways, as its a much easier and faster learning platform for skills (to then immediately apply to the big suit).
As said, Ive flown and coached people in every suit on the planet over the years, and I don't think there is a single wingsuit that doesnt allow you to do one thing or the other. The differences are minimal, and to most a personal preference they will be loud and agressive over, for no reason.
Fly what you like. I could give a lot of reasons to choose a havok, but someone who prefers intrudair or squirrel could probably do the same for the similar offerings in their line-up. So do take all the 'this brand is best' tooting with a grain of salt, and see its often people earning their sponsorship, discount or just airing their like (or hate) for brand X
There's not too many bad choices on the market at the moment...and there are a lot of choices..
If acro is your thing, Id mainly say pick a smaller suit, and even if big suit acro is your thing, the small suit will come in handy for many years to come as 'old faithfull' to learn and try new things with.