Funny, I'm wrestling with an Adamant decision, too: got Virizion this morning, 31/31/17/2/31/31. Not being Jolly should probably be a deal-breaker, but as I'm planning this to be a Salac set, Adamant is workable. Also, am planning this more for Maison use (very rarely play competitively), so that might weigh in on said decision.
Keep or toss?
Vadaam , toss--unlike with the lack of Defense in my Virizion's case, the lack of Speed on the Zekrom is absolutely a deal-breaker (10 Spd IVs is too slow for all standard sets and too fast for Trick Room usage).