For me I have tested this issue several times over the years via A-B testing. Strategies change over time and what didn't work before could work now so that's why I periodically revisit things like Join forms.
For ME (my sites) I find I get more sales when I have different links for each pricing option. I used to have a simple 'Join Now' button with all the options on a dropdown but I found some were not even seeing the other price options so I was limiting my revenue.
BTW: A good place to start is to look at how some other sites do it then go from there. But I always say: what works for a large company or some other webmaster may not work for your specific setup so the only way to really tell is to test. If not A-B then try both options, one week for option A one week for option B. Good luck!!
