Best service for certs

Which sideloading service is currently the best ? I had KravaSign but the cert was revoked just after a month. They don’t look like they will give me another cert or a refund so i have lost all hope in them. What service should i buy now ? I don’t want to get scammed anymore. I have heard a lot about signulous and appresters but they both have a fair share of negative reviews too.