In WS FTP you can group sessions according to their category, ie. LIVE, DEV or by HOST name, whatever you want. Personally I use it to group all my sites by server. I store all my DEV sites on one server.
By having all the DEV and LIVE site sessions in their own group it prevents me from cannoting to the wrong site by mistake.
WinSCP is a fine tool and I am slowly moving my site list over to it. In general it is as fully featured as wsFTP