I'm using Philips Hue, and I'm quite satisfied with them. That being said, I know there are way more options to choose from now compared to when I bought these bulbs about three years ago. I'd recommend checking out a local lighting supply store and playing around with the options. Best Buy and Lowe's carry smart lights but I think they're starting to only carry one or two brands. You'll get more exposure from a specialty LED supplier.

I personally use some home depot branded zigbee bulbs myself. They only do the white temp changing and not rgb but they work rather well in my lamps and other fixtures. I use Home Assistant to do it but I suspect it could be done with any smart home system that supports zigbee lights.