I started with kbin, but as that project declined the lemmy apps were starting to mature, after I found voyager I was all in on lemmy. I still haven’t found a great mobile app for mbin.
Web browsers are the most resource intensive apps these days. Dedicated app doesn’t have to run JavaScript or ask for UI elements over network so it’s better for both battery and bandwidth.
Honestly the biggest issue is that there aren’t many choices of frontends. Like for Lemmy some people use Voyager, some use Boost, Jerboa, Connect, Summit… There’s a ton of choices. The more choices there are the better your chances of finding one that you love.