I would say the 12 will be a bit clearer and have a tiny bit more punch. i havent tried it but i did gig for a year with the EB 150 C-115 and i loved the sound of it. its quite old school sounding but still punchy and it can go loud although just the combo on its own will only give you about 120watts or there abouts and thats at max on the master which is not a good idea.
I would recomend either. its really down to what sound you want or what type of music you play.
I play in a couple of cover bands playing all sorts, from rock and roll to the Killers and the MAG (same sound as the EB, just louder) was always up to the job.
Hope this helps
