I would keep CreditScores.pro in preference to Tablet.pro. CreditScores.net sold for $16,500 in April 08 and CreditScores.tv sold for $890 in July 07. On its own or paired with other words Credit Score(s) has sold in .com, .net, .org, .mobi, .info, .tv, .co.uk, and .us. The only time Tablet sold in another extension was Tablet.info for $485 whereas FreeCreditScores.org sold for $123,000 and FreeCreditScore.info sold for $1,997, ie your word plus another sold for 4 times as much in .info and 250 times as much with another word in .org. Credit Scores is a more lucrative and competed for keyword commercially so it gets bought down through extensions and in more keyword combinations.
If you have a Credit Score website it's easy to change the styles and put it on another domain name with different metatags and content to boost your revenue and crowd out the competition. Tablet and its derivatives has only sold 5 times, all but one of those is .com. It's the .net, .org, .info, and .biz sales that will get the keyword sold in .pro, not a handful of .com sales.
Tablet.pro is short and very brandable, I can see the appeal. It's also potentially technology related which works well with .pro. There are 1,000's of gadgets branded with a Pro suffix. However, I'm not convinced it has general developer appeal, it's going to be a niche market and since .pro is already a niche market, a niche on top of a niche equals no sale. You are more likely to find a buyer for CreditScores.pro because it has more minisite potential and clicks are more valuable.
