I’m going up the Russian TD line and I have seen some pretty fun yolo moves by the 268/4 that suits my manic impulsive play style.

I have unlocked the Tier 8 – But my question is whether I should play the 8 to unlock 9 – and then blueprint and freeXP to Tier 10 —

or BP and fXP the tier 9 and then play that one to unlock tier 10?