I have both an Epilog Rotary and a Trotec Speedy 300 rotary and I personally would get a Trotec rotary. Before I got the SP300 I had the SP100 with the rotary and it was smaller, lighter but didn't have the adjustment features like the SP300 has.
Pros - Easy to use, abilty to adjust angle of object to get a more level position especially when doing wine glasses or bottles that are tapered, abilty to raise and lower the cones to allow for smaller or bigger items to be engraved.
Cons - They are heavy but manageable.