I started playing a compensator 3+1 about 3 years ago. Besides the extra weight, there are still some fingering patterns with the 4th valve that I have to go over and over with to get it right. The arthritis in the right hand is becoming more of an issue as time goes on and the top valve euphoniums are becoming harder to manage. I had bought a 4valve rotary B&S baryton more than 7 years ago and love the horn. The only problem is playing in one community band where no one wants to sit next to me. The other band I play in there is no complaint. I had sold my old Conn 4 in row front valve horn which was an American euphonium. I broke down a bought a used Wessex Festivo which I find much easier to manage and have no problem using it as a 4+1. I guess the way the valves are in line makes it easier after playing for 50 some years with straight 4. I think the Wessex would be easier for you to manage. Again the direction of the bell might be an issue but it's not the same as the oval horn. The only downside to the Festivo is the one I bought was early production so one must be careful not to cross thread the valve caps. My horn was seldom used by the former owner and I find the threading seems to work a little easier after some use. The Wessex has really worked well for me plus the intonation is really good.
B&S 3046 Baritone/Euphonium
Wessex Festivo
B&S PT37-S
Schilke ST20 Tenor Trombone
Jupiter XO Double valve bass trombone