On my M4 I have a Leupold deltapoint 3.5. On my PS90 I have a Cmore RTS 3.5.
Both are small and compact. Both do very well. However the lens doesn't get any clearer than the deltapoints. The dot is a lil more crisp on the Cmore. But I hate the on-off switch on the Cmore. It's a pain. The battery tray is nice but I've not even had to use it yet. Maybe once a year?
Big plus for the deltapoint: it turns itself on when I pick it up, night or day. Something to consider for those split second HD situations.
Edit: almost forgot, adjusting the sights is much easier on the Cmore. Deltapoint is very tedious. However, once it's set, it's set.
I can take some photos of both if ya want.