I have had a good expeience using Exmarkets so far. I would say the UI is reaaly good. The only thing I would change is the staking and unstaking feature, is a bit confusing
The Trading section is very friendly and you can chiise from several diferent trade pairs
They also allow Cardano native assets, which is great and rare to see
You can browse through their Launchpad section and find out new interesting projects and usually have some form of discount on their launch price.
Finally, their online support works great and you can actually get your problem solved in no time
Would recommned exmarkets to anyone looking to trade on exotic pairs