Ill try to keep this short lol
For a primary red dot Ive used various models of EoTechs but all with the same ring dot reticle. Ive used the Comp M2 and T1 micro aimpoints. On vehicle mounted weapons Ive used EoTechs, Elcans and ACOGs.
For secondary red dots ive used the Doctor on a Mk12 in a Wilcox ring mount, a Insight MRDS in the same configuration, a Trijicon RMR ontop of a TA33.
Ive never used anything by Holoson or any of the Leupold or other RDS offerings. Primarily because the RDS ive used were while deployed and worked in those conditions as well as worked well in the way i needed to deploy them.
If your primary goal is shorter distance CQB you wont beat the EoTech in regards to speed as well as how the reticle/size of reticle really reduces the subconscious time needed by the limbic system to realize youre lined up on target and pull the trigger. I dont see a benefit to the green reticle and would just go with the red reticle that has been used by countless people. If you do get the EoTech I would definetly get a riser as it allows for a good, high stock position yet for your hesd to not need to crane forward to get the sight to appear infront of your face/eye with minimal head or stance manipulation.
On my KAC CQB SBR I have this riser and an EoTech xps3.
KAC-Knight's Armament Short Scope Ring Riser, 4 Inches Long, 3/4 Inch High (98063)
www.operationparts.com
The bad news is, for this riser youre going to have to find one as they dont make them and theyre sought after. But the 3/4 inch height, plus EoTech is perfect for bringing the gun up, sight on target as well as using it at night with an ANVIS9 and having enough height and clearance.
If you are considering a more do it all carbine then the EoTech takes a back seat to an Aimpoint T1 or a TA33 ACOG with mounted RMR depending on what you like more; dont look past the 3x TA33 as it can be used almost like a RDS with the BAC it was designed for. Im just as fast with it on target as I am with the T1.
ETA - with any of these, except the ACOG always have a small plastic bag in your carrier admin pouch or your ruck or whatever youre wearing / training in that has 2 spare batteries for your primary sight, secondary sight, night vision equipment and GPS (usually these will overlap a bit) as well as a stuck case removal tool, tiny vial of oil, 2 firing pins and a sawed off toothbrush.