I used a 30 year old Troy-bilt Horse (Kohler) until I inherited a BCS. The BCS is just a better machine- heavier, 3 speed gear transmission, lever to put PTO in or out of gear, clutch on the handlebar (like a motorcycle), forward/reverse control on handlebar also. The weight makes it more of a job to turn around at the row ends, but not too bad. I just do one pass on my garden, good to go- used to do at least 2, maybe 3, with the Troy. There are also attachments for the BCS- little bush-hog type mower, sicklebar mower, several others. But its pretty spendy, I understand.
I'm going to fix up the Troy and give it to my daughter.
I kind of compare the two like Oliver 550 vs. 8N Ford- the BCS is what a Troy wants to be when it grows up.