Both have their pros and cons.
Pros: wide selection lineup, both seperate/bundle selection being available, reasonable pricing structure (some can be questionable), challenges in new stuff/tech, gives out free rewards often, usually able to get communication from dev
Cons: doesn't update/fix their stuff that often, drops support if doesn't succeed
Pros: wide selection lineup, updates/fixes their released stuff, frequent events, challenges in new stuff/tech
Cons: somewhat high in price, doesn't have seperate/bundle selection, doesn't update their public lounges lately (feature wise, not talking about cosmetics changes during events), pay to participate and get reward events, communication is somewhat a hit/miss from dev, items are somewhat more focused toward females (getting better after users complained), many items revealing too much skin, many times rewards are region-specific (need to be in the same regional account such as personal spaces rewards, or items giving out rewards)
So pretty much it all depends if I like the item or not. Dev wise they both have their hits and misses.