Do you mean getting 3 divines and taking them all to platinum stone? I would not do that personally. If you can get enough sigils to do that I’m pretty sure that means you can finish a line.
I bet at your level Equestor is pretty dang good, but long term Avyx is a much better call.
My first season I got Kinnarus and couldn’t imagine a better dragon, now at only level 90 her weaknesses are glaring. She is good for auto-pilot when helping someone with xp runs and is great vs. poorly built/mediocre bases but definitely loses value the higher level you go (using this as an example since Equestor is similar seeming).
Good on you for being patient though! Also don’t take my word as gospel or anything, I’m just offering my low-level opinion.