Batteries are probably something to consider.
The C-more slide ride (longer/bigger) has a unusual battery. I believe you can get them from Makereadyproshop.com.
The C-more RTS2 & Vortex Venom take the flat batteries that look like a nickel. I can find them at Walgreens & CVS pretty easy.
I have both c-mores as well as the Venom. None really use a lot of battery except when I forget to turn them off.
Another consideration is can you change the battery without messing up your sight in. Some red dots have to be taken off the gun for a new battery. I’ve changed both venom & cmore before a stage with no issue.
I have a venom mounted on my PCC, if you come to OKC match on Saturday, you can look at it if you wish. Just let me know to bring it. The RTS2 is on the pistol I will be using & you can look at it also.