Rattler vs. AK-105 for Rangers?

This sounds odd, but I've been swapping around weapons, for the sake of diversity, Been using Rattler for CIA BOs and this thing absolutely rocked, until I switched over to custom AUGs (from SSI), because range, deadliness, versatility and I'm in love with bullpups in general.

I used to run shortened SCARs for Ranger Assault boys, slow ROF and low mag was kinda turn off, plus weapon felt bulky, yet very deadly at most ranges. Been running with M4 later, it's okay, but boring.

Now been testing AK-105 vs Rattlers. Stats say AK wins hands down, but in practice, Rattlers feel WAY more efficient, plus they are shorter (with open tip rounds that is vs. FMJ from AKs). What do you say?

On the side note, what optics would you recommend for either? I usually run with 1/4 Duals, or 1-6 for AKs, but felt very slow.

P.S. What do you run Grenadiers with? I used to run URG-Is, felt like compact sniper rifles. Very deadly and shoot far, but guns are an absolute fishing rods, literally can't move around. Now switched to CQB SCARs with GLs. No opinion yet.