Which aneros to use for a session

I haven't read much on this. But is there a guide or feeling that you should have to know which model aneros to use if you own multiple ones.

I have the helix syn, progasm ice, and the peridise.
I have got nothing from the peridise to date. But the syn and progasm have each gave me great pleasure.

I had a session the other night with the syn and it was great. I achieved a milestone my very first completely hands free orgasm and with ejaculation.

So how do I know which model to choose to use.
do you just grab one and ride or are there signs to look that say I want a rough ride today use the progasm ot let's have a gentle ride to with the helix.