I don't think it's that cut and dry....the best advice for that question is to tell people to pick up each console and feel the weight, size and view the screen differences. Many people find the better, more solid, construction of the 1000 outweighs the disadvantage of TV out (plus IR can mess with people's heads) and the RAM whilst talked about a lot is a minor quibble when playing from MS.
The biggest issue with the 1000 is the d pad being set too low and requiring a relatively easy self mod to make it better. All later models of the PSP fixed this. Honestly the screen isn't that big a deal...