MailChimp Integration with Ninox

To date I have not had a need to use integration services with Ninox. However I want to now link MailChimp to Ninox and in looking I see that there are several options out there ie Zapier, Ingromat and Pabbly to name a few..

I don't need something over complex as I only want to conduct basic tasks. ie user unsubscribed in Mail chimp and I want it to do the same in Ninox/add new subscribers etc.

So as I know that quite a few user have set up integrations - do you have any suggestions which is best/easiest.?