This is a question that is often asked in our store primarily because there are similarly priced products with zero magnification.   Both optics can be co-witnessed and also magnifiers can be used with both product lines.    Even though there is a considerable difference between the battery life times, the real debate is about whether you want a 2 MOA red dot, 4 MOA red dot or a 65MOA circle with a MOA dot in the middle. One reason we have a plastic rifle in our store that is in spec for optics and flashlights is for potential customers to be able to mount the optics and see how well their eye picks up the reticle or dot.   There are some Eotech sights with different configurations for less lethal and for taking longer range shots but they are not is popular as the standard 65MOA/1MOA circle dot.

We stocked the Trijicon SRS sights and although there were initially some issues with the design it does offer a different approach but a very expensive option.   The majority of our customers have a price range and it usually comes down to the Eotech Sights (there are several in the $390-$500 price range) and the Aimpoint Patrol Rifle Optic.   The Patrol rifle optic has a thumb screw mount which, for about $400 you got the whole Aimpoint package without trying to figure out what type of mount to get, usually Larue Tactical but we have recently become a Bobro Mount dealer so there is another  quick detach option with a very good reputation.   The one thing to watch out for with Eotech sights is you really need to make sure you know whether or not you will be putting a magnifier on your AR15 at some point in the future.  If you “might” get an Eotech with a side button configuration.