Have a DSA58 medium, me-self. Tried a H&K 91 way back when ('88 or 89) and it shot well, too. Funny, back then I was working at a range in Kali while going to college, (when life and guns were legal). At that time, The '91 was going for about $1500.00 and I thought it was
way overpriced. Same w/the CAR-15. Should have bought a few of both then.
I bought the DSA because of its excellent rep. and because I like the gas port adjustability - a feature I think every gas operated gun should have.
I don't debate over which is "better", because I figure, if a particular type has been battle tested w/good results, its good enough.
As such, the choice really boils down to personal preferences, which are debatable
ad infinitum. I've had the chance to try them all. All are fun, worth a try, and worth owning.
Now, how thick is
your wallet, laddie?