I play for more than 3 years, tomorrow my last troops (golem) is max. As long as i remember i've never let my lab idle from the day start.
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Level 20 king.
If you're still pondering I'd also suggest valks, simply because the lab would be idle otherwise.
In the future id work towards not getting yourself into this bind and plan upgrades a bit better as a camp can wait but putting off heroes and labs is a sin.
to the OP never put ur lab into idle... that's the bread and butter of this game...
Your heroes should have been 30/30 before pulling the trigger on TH10.
Valks5. However I must say that it was some terrible resource management that you've put yourself in.
As others stated. Never keep lab idle.
Wonder what OP decided. A follow up would be nice.
Go for valks
100% valks