Lasers have a purpose, so I'm not going to argue for or against them. If you are dead set on going with a laser, green is more friendly to the eye and can be seen in various lighting conditions.
As Southerncanuck said, you need to look at lasers objectively and see which is best. Lasers must be zeroed, it's not just slap it on and go.
The Crimson Trace Laserguard, Sig LIMA365, and Streamlight TLR-6 are going to be some of the most common options. Right off the bat, I'll tell you the TLR-6 has crappy controls, but you're likely to find more holster options for it.
I agree with your rationale for a laser. My first was a set of the original Crimson Trace laser grips for a 92FS and it was worth the money. Shooting the same handgun a lot with a laser helps with muscle memory/extension of the hand thing and in my case it helped with quicker point shooting in that all I had to do was pick up the front sight and shoot. My speed and accuracy improved substantially by the time the battery died. For a carry gun it can have pros and cons. It can give away your position or just the fact that you are armed if it comes to trying to maintain any sort of stealth in a situation while acquiring your target. But it can also potentially give you the ability to fire more accurately from adequate cover without exposing much of anything other than the firearm if there’s any sort of peephole in your cover. I guess the main pro is the potential for increased accuracy and confidence in the event you must take a risky shot with a small target or small margin for error.I have red Crimson Trace lasers on most all of my other carry pistols, but opted for the green one (at a handsome premium) for my now primary P365.
Why? You can't see the red lasers in daylight or brighter conditions. The green is easily visible on a target in full sunlight.
I think this is why Crimson Trace sell the green lasers for a premium.
The laser for the P365 has a nice out of the way on/off switch.
Some guys snub their noses at a laser on a pistol, but if it gives me even the slightest advantage-it's worth it.