This version is a little older, but not by too much. The only things I can say for sure have changed is that GUIS have finished both Jetman and Zyuranger if you want to view those.
If Over-Time has it, that's my personal recommendation. That occasionally take a little too much liberty with the translations for my tastes, but they're fucking fast, accurate, they only upload quality video, and the best part is you can change the subs if you don't like something they did.
Unless it's absolutely necessary, stay away from TV-Nihon. I'd be lying if I said they haven't gotten a lot better in recent years, but there videos are still lower in quality than OT's and their subs are hardcoded, so you can't remove them if you want to make a video without them or something.
As for where to start, I'd recommend the following in this order:
Or, if you don't mind going back a bit:
1. Dairanger (TV-Nihon actually isn't too bad on this one)