CPU - GPU pairing, balance, budget

I'm building my very first budget PC and need some final advice.
Everything is set, only need to decide about the CPU and GPU pairing.
Option 1:
i3 8100 with GTX 1050 Ti 4GB
Option 2:
i5 8400 with GTX 1050 2GB
I'm on a budget so better CPU or GPU is not an option not even the 2 better ones together.
I'm not a heavy gamer, it will be used only for WoW, HotS and HS.
Thank you for the advice in advance and let me know if you need further info.