The Engine is a very good RTA.
So is the Reload, Boreas V2, Manta, Azeroth, Exo RTA, Aromamizer Supreme V2, Bellus V2, Tornado Hero, Crius Plus, Troll RTA, Wotofo Conqueror, Griffin 25 Plus,...
There is no such thing like "the best RTA", because they all cater to different needs. And they all have their specific advantages and quirks or disadvantages.