.50 Cal is a great amp.
Extremely warm cleans.
Great distortions, but you sacrifice clean headroom if you turn the gain up too high.
Reverb is nice.
DC-5
Cleans are more sterile.
Distortions can be really brutal or bluesy or anywhere in between.
Reverb is nice.
Had both.
I kept the DC-5, only because my .50 Cal had to be cranked a bit to sound good. At the time I wasn't playing with anyone and simply using it in my music room was too much. The DC sounded better at lower volumes.
Now that I have a band again, I just might pick up a .50 Cal again. Great amp for cheap.
Mike B. at Mesa says that the EL-84 models are much more aggressive than the 6L6's.