I had hue already so I use those, and some INNR lights which also work fine with hue and alexa.
For plugs, I tried a couple brands and I prefer osram smartplugs. TPlink also worked fine but I didn't like the look of them as much they take up too much room so I sold mine.
If you want a way to control 12V appliances I would go with belkin wemo, they also work ok with hue and alexa.
I ended up with just the osrams because they don't need a separate app, they are ok price-wise, they work, they have a manual button as well, and I like their look. I try to not need a bunch of different apps...
If you need a plug that's also a dimmer, see if you can find some (2nd hand) philips lightify plugs (on ebay for instance).
My parents have xiaomi lightbulbs, they also work fine with alexa, but the color spectrum is different from european (very very white mainly). Pricewise very good of course.
I also have some sonoff plugs, still have to try those and if they work good I'll install them at my parent's.