Winter is a slim season this year, though there are a couple gems. Because of the partnership between Funimation and Crunchyroll, most new anime brought to the US now is streaming on the former (if dubbed) or the latter (if subtitled) and I’m watching entirely on Crunchyroll again. Though there are other players in the licensing market now, like Amazon and Netflix, the former does not regularly simulcast and the latter never does.
Amazon has started it’s own Anime Strike streaming channel for an additional $5/month on top of Amazon Prime membership (US members-only), but with only a handful of exclusives and two winter simulcasts it’s hard to justify at this point. The dollar goes so much farther with their competitors.