Im in the same boat, but I chose to stay and upgrade my lego walls.
I'm doing about four walls per day, or farming 4million gold.
While I'm doing it, I'm continuing my few remaining lab upgrades and upgrading my king and queen.
I decided that once I finish at least one of those three - heroes, labs, or lvl 9 walls - I'll begin my TH10 upgrade. I think I'll finish my walls and lab upgrades at the same time though, so that will be nice.
I just think that if you're going to have a respectable TH10, you need lego walls.
Just my opinion, but I'm loving the legos I have so far!



They are very easy to get at TH9 and shouldn't take you too long, buy some gems, boost rax at 1500-1800 and 2 months at most
Goodluck with what ever you end up doing