If you know your weapon/gun, keep it clean, and understand how it works in and out-- every weapon is reliable these days, granted it is from a reputable manufacturer.
Sure, there are rifles the you can drag through the mud, shoot from the inside of the sun or whatever-- but mostly, it is all the same. You should choose a rifle based on what you want it for or what it is intended purpose will be. There are limitations to ALL guns. Every gun has pros and cons.
For target shooting or plinking, get something with cheap ammo (.22LR for example). If you like the AR platforms, you can get them in these calibers. They are very fun to shoot.
.223, .308, etcetera has gotten ridiculous on price. So, strictly for short range target shooting (<300m), I would consider ammunition cost.