For now, use them all. I’m using Memmy, mlem, liftoff, wefwef, lemmy.world as a PWA, and thunder. So far it seems Memmy, mlem and wefwef are the most “iOS” of the bunch, but several variants have their ups and downs. For example, when I want a link to a community in the cleanest form, I go to mlem (three dots in top level of community provides a share button). Memmy is my main daily driver and does my notifications. Wefwef is just amazing that it is a web app. Thunder and liftoff feel like what I expect android to feel like (material design).
I expect I will settle into Memmy, mlem and wefwef with some occasional web app and website usage of lemmy.world, it is great to try them all right now.
We have options with servers, and options with apps, and we have no need for monogamy among these fine options.
https://youtu.be/4p0fRlCHYyg
This is a good analysis of concords failure and what may come in supersonic flight soon.