It is a very tough choice! The Mesa is simply a fantastic amp! I had a JP-2C that I sold last year. I probably should have kept it as I do miss it. So many great options on it and fairly easy to carry around and gig with.
The EQ on that amp is so powerful. 3 great sounding channels as well as well as the shred mode. I have used the amp live many times and it sounds great. The 60W mode on the back that you can switch it to has a great tone to it as well. The midi is also a great feature to have.
What I don’t like about the JP-2C:
-the stupid reverb tank. Really Mesa, cut a hole in the bottom of the headshell just to accommodate this? What a waste of wood. Yes, you can simply take it out but then you would be left with a nice big hole to cover up.
-the midi and footswitch inputs on the back are less than robust. These will fail over time faster than a higher quality socket.
-the footswitch is massive. (Then again, I could just use Midi to switch it)
-The shred mode is not footswitchable with the stock Mesa Footswitch. I wish John have made a decision on that one and had them replace the reverb on and off with the shred mode on and off. The only way you can footswitch it is via midi commands. I have tried with 2 midi platforms and it would work only sporadically. I could not turn off the mode with a command other than switching to another preset and even at that, sometimes it would remain on and other times it would switch back. This was using the included midi commands that Mesa gave for that mode to be on and off. If I got another one, I would probably ship it back to Mesa to have them modify it to use the reverb switch to turn the shred mode on and off instead.
That being said, I have the JJ Jr. This amp is just amazing as well. All three channels have great tone to it. I literally just sold my BE-50 head and 212. I needed something lighter to carry around as my back is not great with a couple of degenerating discs. I went from over 100lbs to carry to less than 50. Not as much volume obviously, but I haven’t noticed enough to worry about it.
What I love about it:
-BE tone, great clean tone, and that JJ sound. Fabulous!
-very good direct to FOH out the back without even needing a cabinet attached.
-Loud for an EL-84 and only 20 watts!
-does not get wooly or mushy
What most will not like about it:
-volume discrepancy between 2 gain channels
-can’t footswitch between 3 channels
-EL-84s. Some folks really do not like this tube. I am not sure what magic Dave did here but it works!
If you need more power, then the Mesa would be a logical choice but you have to realize, it is that classic 2C+ sound with that cascading gain. It is a much different tone than the modified and objectively smoothed out modified Marshall tone that Friedman is known for. I am a fan of both tones.
To me, it sounds like you may be looking for the Mesa tone. Either way, you can’t lose!