Here's what you need to do:
1. Work out the specs of what you need.
2. Go and play the amps.
3. Buy the amp.

The most important part is #1. You need to know what you want the amp for.. there's no point getting a huge 150w tube head with a 4x12" stack for busking down corner of some street.. there's also no point buying a 15w portable acoustic amp for a live rock'n'roll performance in a club... Marshall have always been associated with the heavier stuff.. but I've heard good things about Krank..

I own Fenders because I like clean, bluesy tones and that's what Fender amps do the best job at doing. I have a 120w 2x10" stereo chorus amp, and also a smaller 65w 12" DSP amp.. I use the 65w more these days because the gigs I do don't require anything bigger than that.. The 120w amp is just so heavy and cumbersome..not to mention loud.. but the 65w 12" is still to loud to be honest.. I barely even scratch 2 on the volume dial when I am performing.

Seriously.. it's like buying anything.. first you need to know what you want/need it to do.. then you can start to look. If you have already done that and are down to just two choices, take a band member with you to a store with the amps and have a play. The band member will be honest with you and tell you if they suck, or are too big, or whatever.. well they should, if they are being honest and helpful.