I think it's great there'll be two dubs for DBS.
In most cases it's just a matter of one being in a language I speak, and the other(s) not, but in cases like this it'll be fun to compare them and think about which I like more.
OG DBZ had this for the Ocean dub vs the Funi dub, but in most cases you only get two (competent, so not Big Green or Singapore One Piece) dubs if it's a remade series or new adaptation or redub like Sailor Moon.
Speaking of which, I did some comparison videos for the old JoJo OVA vs the test dub of the new anime
(SPOILERS for past where Toonami is)
https://www.youtube.com/watch?v=jFXSsCSpymE
https://www.youtube.com/watch?v=JO_UwuGbl6w
I think next I'll do a series comparing the HxH 1999 anime vs the 2011 one in English.