Well, first off, wanted to point out a similar thread I started and the responses it got:
http://www.gamesas.com/topic/1350360-best-choices-for-blades-recruits/page__p__20363582__hl__blades%20recruits__fromsearch__1#entry20363582
...and then wanted to update you on who I ended up choosing on my current playthrough.
I opted for Nord males with heavy armor, one-handed, archery, and block - and with no other major skill areas - I wanted Blade uniformity - so my choices were:
- Torvar - one of the recruitable Companions who has no function other than to offer to follow you
- Golldir - adventurer from Hillgrund's Tomb who will just sit outside the tomb indefinitely (after you complete his quest) unless you ask him to follow you
- Vorstag - mercenary from the Silver-Blood Inn in Markarth - the only male Nord merc option with the aforementioned skill specializations
The reason for my choices are that Blade wear heavy armor and wield 1H sword w/ shields and bows. And since this is the Skyrim "branch" I opted for Nords, and since I am more likely to use a female follower, I didn't want them to be tied up in Blades' business, hence I chose only male recruits.