I don't know if this has been asked before, but which is better as a flash card app or for their SRS, Migaku or Anki?

Anki is free but to tailor the cards to your liking can be a pain -- although you could use other peoples HTML.

Migaku is a paid service that you can use on your phone. If you wanna use Anki on your phone then it's a $25 one-time payment. You can also somewhat mine words with Migaku

Which do you think is better?

How do you actually use it?
Anki was super handy for medical terminology since I could just use other people's decks, but making cards to learn English through Japanese manga was honestly such a pain.

Any time I see a useful word, I'll either mine it or add it to a deck (like a word from reading or from a tiktok or something), find existing example sentences and add it, and try to create my own example sentences. for review, I copy and paste the japanese into VOICEVOX for listening practice

I dread using ANKI, maybe because I’ve burnt out on SRS, that said, I’d still recommend it because it’s free, and the whole point of learning is that you tailor it to YOUR liking, so making cards is also part of the process, tedious yes, but that’s how it’s done.

Best of luck!

You might find some free apps for immersion if you check out places like The Moe Way.

It looks like Chimahon, for example, lets you read manga through a mobile app.

If it fits what you're looking for, you should check it out!

I wouldn't recommend paying a subscription for anything that doesn't have any reason to be sold as an ongoing service. Besides patches for when their tool breaks when a website becomes incompatible what are they offering?

Check out the kiku or lapis note type.

I use both, if you want to be able to mine on mobile or bulk add cards I don't think there's an option other than migaku

Jidoujisho let's you mine on mobile! (Android at least, not sure about iOS)

Don’t pay. I bought a lifetime Lingopie subscription when I was first starting out and they immediately cut a lot of their capability and library immediately. Despite how much they pay influencers to tell you they all use migaku, they don’t. I wouldn’t depending on a service for your vocab collection.

to tailor the cards to your liking can be a pain

If you are on android you can just mine on mobile using yomitan like you would on PC

Slightly agree, except they have more than just tools. Cloud service, multiple courses (more coming), AI integration (for those who dont mind it) and a built in srs system. Yes you can get all these seperately for free and for a bit of hassle but they set it all up for you. On a discount the price models are not bad as well. I think this is worth it if you down the paid route