Well, I am working on my heros and the last dark troops and spells for TH10, so I do DE farming all the time for the next few months.
I am TH10 and have maxed all defenses and Lego + >100 lava walls.
If I want to try out TH10.5 after maxing heros how should I proceed.
I understand that I should upgrade all troops (currently only minions, bowlers and witches)
What defenses should I upgrade and buy?
What defenses should I not upgrade or buy?
Is it a good choice?

