I have quite a few bits of old iron hanging around, mainly SSP’s and CO2 and for ease of use, consistency and fun I do find myself using my TAU 7 quite a lot, not as much as the CPM1 but nearly. I get 85 shots out of mine before I run out of liquid CO2 which is more than enough for a AP60 match (if you need more than 5 sighters you might need to do some more training), which is because it’s easy to adjust the power output (within reason). Best bet will be to see if you can find someone or a shooting club where there is a range of pistols and ask nicely if you can try them to see which suits you. Or like most here buy lots then find out which one you like most till you buy another and then you will always have one to go back to remind you how good the new one (CPM1j is compared to the old one (Original 6g).