First of all, may I ask what your budget is? If you want a basic economy model one, I would suggest going for a Geberit one. If you're looking for a more intelligent toilet, then get yourself a Sub Royal Clean + one. Second, you'll have to think about the design. Do you want an elongated or a round-fronted one? A standard height or a chair-height one? A 1 piece or a 2 piece toilet? Yeah, there's a lot to consider before actually buying a toilet, so do make sure you research your options before purchasing it. I'll share this helpful comparison guide between 1 piece and 2 piece toilets to ease your job: https://sanitaryreview.com/1-piece-vs-2-piece-toilet/
. I hope this will come in handy!