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It's not that Snapseed is too limited for basic editing, far from it - the app is well-made and still pretty complete. But it's worth switching if your workflow grows a bit: Lightroom has better photo organization, more predictable non-destructive edits, and device syncing that actually works. If you just want to adjust brightness, contrast, and saturation occasionally, Snapseed is more than enough for you.
Lightroom really shines when you start accumulating photos. You get catalogs, tags, a more detailed histogram, and presets that apply consistently across an entire folder. Plus, if you later feel like moving to more serious editing, Lightroom lets you export to Photoshop without losing information. Snapseed, on the other hand, is more of an "open, edit, save" kind of thing with not much infrastructure behind it.
What probably holds you back is Adobe's subscription, which isn't cheap. If you edit photos on your phone occasionally and don't have hundreds of images to organize, stick with Snapseed. But if you end up editing a couple times a week and want your changes to be reproducible without having to save different versions, Lightroom would be worth it. Try Lightroom's free version for a couple weeks and see if you like the interface better.
Snapseed is still completely functional for the basics, so switching really depends on whether you're planning to organize a lot of photos afterward. What I personally notice is that Lightroom shines when you have a large volume of images and want to keep everything synced across devices, but if you're only editing the occasional photo here and there, honestly you've already got more than enough with what you have.
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