With good honest reputable programs I highly prefer a 50/50 rev share. But it is extremely important to me that they keep everything on the up and up. That is, NO shaving, full credit for any exit and entrance consoles, my share of any cross sells, unlimited recurrs (none of the stop paying commision on rebills after 1/2/3 months BS). If they have a great members area, I know I will make a lot with them and stick around for a long time.
With ones that I am not sure about whether to trust, I just prefer PPS, if I have to use them at all. While the popular opinion is that you get shaved less on revshare, I do not buy it. It seems there are more opportunities to shave when doing revshare (such as the rebills) and if they are going to shave me at all and are that kind of people, human nature says that they'll probably need cash and try to get at me on the revshare too. For them, just give me the $ upfront because I cannot count on rebills. If I detect them shaving me on the PPS and start to see bad ratios, I'll drop them until/if they improve. Very easy. But the rebills I can't do anything about on a revshare and once I send them I am screwed.
As for the trials on revshare, I prefer a trial that has a price around $5 - $7 and getting a straight 50% cut. One major sponsior I use does this and while not all trials convert, when they do it is still nice to get $3.95 for them and the standard membership 50% cut too -- I actually come out ahead.

If it is PPS however, I expect to be paid the normal commision. If they want to pay me less for trials on PPS, I think I should be able to send traffic to a no-trials page then and have that control. Too many ways to rip me off there with the trials.
About your program. This is twice that I have seen you on this board asking for input from webmasters and actually listening to feedback. I love that and see it as a good sign. I would definitely put you in the more "trusted" category and would prefer a 50/50 revshare with you given that. I will be signing up for your program, without doubt seeing what I have from you.
added thought: I notice with very good sites and honest programs it is not unusual to get a core of members who will rebill for years - thats what I look for too.