I asked this question earlier but I wasn't clear.

I'd like some suggestions on a keyboard for my PC (running Ubuntu) and MacBook Pro.

I'd prefer it to be wireless but I'm cool with wired as well.

What else other than apple keyboard

If you wanna go wired:
Cougar Attack X3
(Also available as RGB if you want it)
You can choose from red brown blue or black cherry switches and it’s quite affordable for a mechanical board

I rock the rgb version at home and the normal one at work; both with brown switches