Well, my reason for doing RC5 is because its the one I started. IMO, it has the best stats (except for the occassions that stats go out...which usually isn't very often). They look pretty too 😛 But in all seriousness, I do it because I started it, because we were just a small team at first, and have just recently become the #1 team in the world because of all our members hard efforts. We have stiff competition from the Dutch Power Cows, who are nearing 2nd place, and could ursurp our position.
With S@H, the team is progressing very, very well. They are now...I believe 15th? I'm uncertain, but I know that they've made great headway, as they were battling to make it into the top 20 for quite some time. They've made it, and Hellburner updates stats daily, by hand, for the team (thanks hellburner!). He also does weekly stats updates.🙂
For me, its also a matter of efficiency. I try to do whatever is most efficient. For awhile, I was on my Cyrix machine, which is far more efficient at RC5 than any other project (due to it having a really crappy FPU). I am now on a (quasi-stable) athlon, which is doing....well, it might be doing a rotation of everything, because its good at evertying!
Why not tell us what machine(s) you have, and we'll tell you what they are most efficient at. If you don't care if its more efficient at one thing than another, and just want to do a particular project, we're all cool with that, and won't bother you about your choice 😉
Hymmmm........anything else?