If you are in the USA, there isn't really a need to sign up for a specific Anime Streaming service. Subscribe to VRV, then link that account to your Crunchyroll and Funimation accounts (to get access to the entire libraries). If you have Netflix you already have their Anime Library. Same with Hulu. If you have Amazon Prime you are half of the way there for Amazon Anime as you just need to subscribe to Anime Strike (which while the service is mediocre, they are picking up some good shows season after season)
Though if you are on a budget, and you want the best bang for your buck I'd personally rank these Services in order of best-value.
1: VRV (and Link Account to Crunchyroll and Funimation)
1.5: (If VRV is not available). Crunchyroll(Subs) then Funimation(Dubs), or vice versa depending on preference
2: Amazon Prime + Anime Strike
3: Netflix
4: Hulu