VRV combines the libraries of Crunchyroll and HiDive together (plus other miscellaneous non-anime content) into one service for a price cheaper than the two separately, so it's the best one for sheer variety of anime series for the best price. Funimation is generally considered the best specifically in regards to English dubbed anime. They have the most dubbed series and their simuldubs (when the coronavirus isn't throwing a wrench into things) are generally the fastest every season, only 2-3 episodes behind the subbed broadcasts for the same shows. If you can afford two sites, then VRV + Funimation gives you absolutely massive coverage because there's very little overlap between the shows on Funimation and the shows on Crunchyroll or HiDive, and what little overlap they have usually boils down to Funimation having the dub of a show while Crunchyroll has the sub.
The only thing you might miss out on with VRV + Funimation is the odd Viz dub (those tend to pop up on Hulu or be exclusive to disc releases).