Difference between uTorrent and others?

What's the difference between uTorrent and all the other programs?
I know that uTorrent is much smaller but what are pros/cons of it other than not slowing down your computer as much as the others?

thanks

and also Seeds a(b) and Peers a(b)

what do the variables stand for?

short: https://torrentfreak.com/bittorrent-client-comparison/
detailed: https://en.wikipedia.org/wiki/Comparison_of_BitTorrent_clients

a is amount you're connected to and b is the total amount in swarm.