ROHS bunch would shoot me for saying this, but lead solder all the way. I ran out last month and have been using some sh*tty 'lead free' stuff from Craplins (hey, desperate times) and it's absolutely rubbish to work with.
Just my 2p worth!
Use it in a well ventilated area though*
*whilst wearing a mask, gloves, goggles, condom etc...