Both specs and online services are definitely worth comparing.The only useful comparison (except maybe the online services) are the video game libraries.
Specs less so because they'll both likely get mostly the same games but as far as exclusives are concerned that might be a factor.
And when the online service is giving you free games(well besides the subscription fee) and you know actually has an account system that works and most of the gaming you are going to be doing is multiplayer then how is it just a maybe useful comparison?