I havnt seen a thread comparing these two amp COMBOS. I've tried the GK mb212 ii(let me emphasize its the 2nd model), and really liked it. I havnt had the chance to try the Fender rumble 500. Main question: what is the difference in TONE of these two combo amps? I am aware of all the other features of these amps but i am mainly concerned about how they differ in tone. Any other thoughts would be appreciated, however, tone is the main subject here.