Connect is great on phones, and Infinity is very customizable and works well on tablets. Both have very active developer support.
Free and Open Source Software
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Good resource for all platforms: https://lemdro.id/post/4319
Constantly updated, so make sure to check in there every couple of weeks.
I think most apps are decent in their own way and appeal to different users. Some want a simple client that just does what it needs to do, some prefer complete customization, some prefer having the exact same interface that they had on reddit, some prefer something a little different.
Infinity, Sync, Liftoff, Jerboa, Thunder, just to name a few, are all good for different reasons. Some upcoming ones look really nice (particularly Artemis which will be for Kbin and, shortly later, Lemmy) and several are cross-platform, which is a benefit when suggesting something that everyone can use.
I personally really like the Photon web app UI. And since it's a web app, it's platform agnostic as well which is nice. (Another bonus is that any instance can use it and other web app interfaces as potential alternative interfaces for the entire instance, like lemdro.id using Photon for https://nu.lemdro.id/)
To be honest, I just stick with the web interface at this point. I've become so used to it and I don't feel like using apps that were reddit ones or try to emulate them or reddit in general. Prefer Lemmy feeling a bit, if only a little, different from my previous time on the orange nightmare site, but I get why others prefer them for familiarity.
Really liking Arctius, but also still switching use between Jerboa, Thunder and Liftoff as well.
Arcticus? Never heard of it, and I couldn't find anything online. Do you have a link?
What do you want to do that you cant easily do on mobile browser?