I like the LTS better - that small bit hanging out the muzzle of thr PRO did catch on my holster.
Even though you cannot do double taps with a sao you can learn an awful lot about both trigger control and the different effects of holding your gun at an angle as opposed to straight. 15 minutes a day of dry fire practice a month as opposed to live fire and you have met your initial cost.
A hint - 3x3 squares of aluminum foil, crinkled up and then flattened out make great laser reflectors - put them all over the house for practice. (with the insert it is impossible to chamber a live round - it does not just eject if you cycle the slide)
stay safe.