Advice needed- Which to keep and which to sell?

I happen to have 2 PSP units. One with 2.81 and a mint one with original 1.5 on it. I'd like to sell one, but can't figure out if the one with 1.5 is really worth more just because of the firmware. Wanted to sell it on my local Craigslist, but cant find any good info on the value of an original set up. I know I can work with the 2.81 but just needed opinions. Thanks.

well there both fully hackable phats so you can always put them back to ofw 1.50 so it dose not matter which psp you sell and you might get 60 to 80 for it maybe