Which Hero should i pick first?

[LumpyMilk]

My archer is lvl 51 and i want it to be Warden
My Inf is lvl 44 and i want it to be Legion

I have about 450k rn and maybe by the time i get my inf to 52 i will have 750k.

Anyway, was just asking for your opinion, on what i should get first.  Warden, or Legion.

Thanks,
Lumpy