I use desktop whenever I can since I kept messing up with typos on phone. I don’t trust myself with a rollback button, so I just use desktop. Also, WaniKani’s hiragana input sometimes misses characters when I’m typing fast on my phone, which really breaks my rhythm.
I cycle between computer, phone, and tablet depending on what’s easiest for me to reach at the time.
It’s not the best habit, but if I get something wrong on desktop WaniKani for a reason I don’t agree with (I typed a synonym or my fingers slipped), I’ll usually hop over to Tsurukame and finish the reviews there. WaniKani and Tsurukame only sync each item right after you type the correct meaning and reading. It’s cheating but I have ways to make up for it elsewhere.
EDIT: Just the day before yesterday, I started using the scripts that @ekg mentioned in this post and so far I like them. I don’t think any scripts are necessary, though. You’ll be fine without them.
I tend to flip between them. Tsurukame has a bunch of options that are only available with scripts on the computer, but there are plenty of scripts that do not have counterparts on Tsurukame. If I’m sitting with my computer, I prefer it, I can type much faster than I can kana-keyboard-swipe. But if I’m out and about, I’ll use my phone.
If I get behind on reviews and only want to do a certain subset, the computer will allow me to sort by level and type, but Tsurukame will allow me to sort by newest first, or lowest SRS level first. Different options for different circumstances.
I like using flaming durtles because it allows me to do reviews offline even if wk servers have issues. On the pc I will just get the time out repeatedly in those scenarios. Also 12 key swipe is more fun to use personally.
I’m using the Kakumei app for Android. Very rarely using desktop even though I type way faster on the computer. This way I never forget to do my reviews (which would have been the case if I used desktop).
I use desktop primarily for speed (and I don’t have a lot of data), but I will check out the android app. Using the mobile kana keyboard is time consuming, but I’m very visual so finding the correct character helps cement things in when I have used it in the past.
prefer pc - I’m a better typist on the computer, and it definitely takes me less time to finish my reviews. But, I keep my Flaming Durtles up to date, especially for when I’m out of internet range/travelling. Usually I fit my review blocks in to times when I’m home/at my work computer.
I’m pretty fast with the kana keyboard now (from lots of dictionary lookups), but still don’t love typing for reviews on my phone - and really dislike typing on my iPad.
Flaming Durtles has incorporated several scripts that are most useful, including Ultimate Timeline (albeit only 24 hours) and Self-Study. Of course it cannot include all scripts, but those are the most useful, I think.
I do lessons exclusively on PC, but when doing reviews I’ll just use whatever device I have nearby. When I’m at home I use PC, and when not at home I use Flaming Durtles.