If you are dead on a laser... TLR-2 or TLR-8.
But I’ll recommend TLR-1 or TLR-7. The important part of both is the same. The first group cost more, and they put a laser on it for some odd reason.
If OP is using the laser strictly for actual shooting, I’m against it. A lot was gone over already, so not going to restate the same. However, if he was going to use it for dry-fire practice... I’d be ok with it (I do confirm zero from time to time... just in case I’d ever have to use it). Hell, I pulled the laser/light module out of my P938 TLR-6 for one that was light only.
Been up in Maine for the past two days, and the gun (S&W 642-1) I’ve been carrying does have a laser on it. Just took it off in the hotel room, and noticed the switch for the laser is still on. Didn’t remember turning it on since I pulled it out of the state... so likely from the last dry fire practice. If you can use the gun well, and not need to worry about the laser being on, I’d support your decision to buy one. If not, don’t buy it... as you’ll likely use it as a crutch and not train to get better. Sorry to be blunt with it, but just keeping it real... is that still cool to say?