I always used to drag my Cornford to rehearsals but I'm now settled in a decent multi room rehearsal studio that has decent backline so I've been using whatever amp is available at the time. In the last couple of months I've used the following half stacks - Marshall JCM900, Marshall SLX, Marshall Jubilee and Mesa Dual Rectifier. Combos have included a modern split channel Hiwatt, Fender Twin split channel and a Fender Deville (older model, not the Hotrod).
There's been others that have slipped my mind. I always play my Gibson Firebird Studio with RYs. I always set up a crunch rhythm sound and sometimes go through a Boss OD3 for a little extra kick.
I haven't used Marshalls in years although I've owned a few way back. A big surprise was the JCM900 split channel head. It seems to have a terrible reputation but I really enjoyed it. I got a great sound with the 'clean' channel gain maxed. Not so fond of the SLX. There was something about the mids that didn't sit quite right with me but I would have happily gigged with it - I just preferred the 900. Best of the Marshalls though was the Jubilee. I LOVED this amp. I had the 1 x 12 combo at one time and regret letting it go. Great variety of gain sounds available and sounded very good without being cranked too much - maybe that's the diodes. I would love to gig this amp.
Biggest surprise however was the Twin. Never seen this model before and I want to try it again. It was possible to get some terrible sounds from it but once I'd got the treble and presence sorted it it sounded like a really great Marshall. The best of the batch just ahead of the Jubilee.
The worst ? The Deville by far. The overdrive channel stinks and there was nothing I could do about it. Running it closely for last place was the Rectifier. Now I know this is more of a metal amp but I thought I should be able to get a decent crunch sound out of it. Not a chance. No matter what I did the top strings E and A sounded awful. Either as dull as dishwater or thin and screechy. Running at metal gain levels didn't improve things. Seemed to have no dynamics.
I know there's a lot of variables - tubes, speakers etc. These are just my experiences. I'm going to try and find out more about the Twin and I'd certainly bag a Jubilee if one came within reach.