Question Should I have 2 120mm or 1 120mm & 1 140mm case fans? nzxt h500

[Kwork]

My case is NZXT's h500. I'm looking to replace my stock fans, which are 2 exhausts, one rear and one top. Both are right next to one another. Anyways, I'm wondering how having a 120mm and a 140mm in that case's set up could effect air flow??
Since their both exhausts, would the rear 120mm disrupt the airflow of the top 140mm? I'm sure its not really going to matter, but if I do decide to have a 140 instead of 2 120s, I want to make sure that it's optimized for airflow.
Any advice, feedback, or numbers are appreciated! Thanks!

 

[Dark Lord of Tech]

Using the 120mm and 140mm IN THOSE POSITIONS is just fine no adverse affects.

 

[Kwork]

Thanks you O' great dark one haha. Anyways, I'm assuming so, but wondering the thoughts of anyone who has something similar to this or simply has tested it. Thanks for the reassurance!