The visible aiming lasers on various MFALs are not all the same--IR aiming lasers are all fairly similar because they all have to adhere to the FDA's Class I output requirements, so they're all about 0.7mW nominal.
The FDA does also regulate visible lasers, but they are not regulated the same way--the reason that IR lasers are a "special case" is that they are "invisible," and therefore do not trigger a blink reflex, increasing the chances of eye damage.
Steiner has some of the best visible green lasers on an MFAL, especially the Class IIIB DBAL-A3, and we've had more than one LE agency opt for the DBAL-A3 on that basis, as the green visible laser can be used for EOF or air/ground signaling.
Even the Class I DBALs with the green visible lasers are pretty good, though not as powerful as the restricted output versions.
All that being said, for most people it doesn't really make much sense to buy a complete IR Multi-Function Aiming Laser (MFAL) like the DBAL or MAWL or others, just to primarily make use of the visible laser, as a large part of the cost is the IR aiming laser and illuminator that it sounds like you are not planning to use, or use much.
If anything, if you're dead-set on going in that direction, I would recommend the DBAL-I2 dual spectrum (IR aiming laser + visible aiming laser), which is discontinued, but currently available on clearance through Kosher Surplus for under $600 for the green aiming laser version.
However, before doing that, I would recommend that you evaluate your aiming needs before making a purchase--you mention using the visible aiming laser on a subgun during the daytime, however, this may not be the best solution compared to a red dot sight--even the brightest visible lasers are sensitive to lighting conditions and distances, and I would not generally rely on them as a sole sighting device for daylight engagements. While there are specific circumstances in which visible aiming lasers can be useful, your primary aiming method should remain a daylight bright optic.
~Augee