Looking at a mini dot sight

I'm looking for something that could POSSIBLY do double duty on my AR or my pistol
1. So many variations of RMR. Triangle or dot reticle , led , dual illuminated ?

2. Delta point less variations - looked through one today and it seemed pretty sweet

My first use would actually be on an AR , but I also want to try on a pistol too

I'm looking for any help here before I make a $500 error

I'm going to also post in AR/optic

I have a Deltapoint.

The main problem is mounts.

I use it as a primary on my SBR, and it works well.

I have both. DP on my Saiga 3 gun shotgun. RMR on my duty pistol. Trijicon or Aimpoint would  be my only choices for a defensive weapon. Just my 2 cents.

Now I'd buy the green triangle if I was buying today. It wasn't an option when I bought mine.

A lot of the research I've done points to Trijicon. Suarez intl and some other slide milling co.s have gone to RMR only for durability  of optic [racking slide and other abuse]. FWIW.