Lots of factors. Do you want spot lock? What features are you wanting? How do you fish? What kind if any electronics are you running? How big is your boat length weight etc.
I replaced my MK Ulterra with an ULTREX and love it. I had a EDGE and didn’t like it at all. Remote controlled TMs allowing you to drive the boat while away from the foot pedal are awesome. Many options out there it’s mind boggling.