Those wheels are great, but I find them pretty expensive. I just bought some cheap reinforced cutting wheels off amazon, and just used them to replace the side-stand foot, and they actually worked great, and at a price of I think 50 for about $6.
I lent my angle grinder to someone and can't remember who now, and this job really needed the angle grinder. The dremel was a lot slower, but I was pretty impressed that it only took about 4 wheels to do the whole job.
My good deal aside, I will say that the cheap bulk wheels are very hit or miss. Mine don't technically fit a dremel grinding wheel bit as the hole is too big, but I tightened them down anyway and they worked fine. Not all cheapo wheels are this good though. I have used some of the non-reinforced bulk wheels, very similar to the dremel brand ones, and they wore away extremely quickly.
Honestly, for just cutting a chain, any cutting wheel will work. You could even use a hack saw.
2002 DL1000: 75k miles. Bought at 50k miles.
1992 XJ600: Red, Very custom.
2002 Vespa ET4 150: The wife's ride.