Best grammar checker tools: Grammarly, ProWritingAid, or just the old-school way?

[AnnaMarya]

I'm an international student, and English is my second language. I've gotten pretty good at academic writing, but I still make small grammar mistakes—prepositions, articles, comma splices—that my professors always catch. It's frustrating because I know the content is good, but the presentation is sloppy.

I've been using the free version of Grammarly, and it's... okay. But it flags so many things that aren't actually wrong, or it suggests "fixes" that change my meaning. I spend half my time arguing with it.

I'm thinking about upgrading to the premium version, or maybe trying ProWritingAid. But I'm not sure which one is better for academic writing. I've also heard of Hemingway Editor, but that seems more for style than grammar.

For those who've used these tools:

• Grammarly Premium: Is it worth it? Does it actually catch nuanced errors, or just the same basic stuff?
• ProWritingAid: I heard it's better for in-depth reports and style suggestions. Is it overkill for a coursework essay?
• The old-school way: Is there any substitute for just printing it out, reading it aloud, and having a friend look at it? I do this too, but it's time-consuming and my friends are busy.

I don't want a tool that writes for me. I want one that teaches me, so I stop making the same mistakes. Which one is better for actually learning the rules? Or should I just suck it up and go to the writing center every time? (Spoiler: I don't have time for that.)