Want to use it on a Glock19 Gen 4 for home defense. Also would like to be able to mount it on an AR.

I see the TLR1 is just a light whereas the TLR4 is the light and laser combo.

I like the idea of a laser too but other than the TLR1 being slightly brighter, is it that much better to give up the laser of the TLR4?

Do they both fit well on the Gen4 Glocks and are user friendly to operate?