how to select a suitable affiliate add-on?

a question of affiliate add-on

I am looking for a good affiliate add-on for promoting my site.

there many affiliate , zen-cart affiliate add-on, snap affiliate add-on, Jrox add-on.
And there are also many affiliate Marketing websites.

are these affiliate add-ons are limited to be used with a certain affiliate marketing website?
for example, does the zen-cart affiliate add-on work with Jrox.com?
how to select, please help.

Finding the right affiliate software for you will depend on your specific requirements so the process would go something like this:

1. write down all the features that you need
2. draw up a list of potential candidates (Google's good for this)
3. check which are compatible with Zen Cart (Jrox says it is)
4. compare their published features with those you need (this may also give you ideas that cause you to refine your features list)
5. select the one that most closely matches what you need

to Kuroi,
Thank you so much!!
I am considering the affiliates and dropshipping.
probabaly have to choose one of them