We would recommend trying the services in small quantity first. This way you can track the speed, drop rate, quality and more ...
This takes time but you can find services that you like doing so. Once you find the one you like, use those for your clients.
Service names on smm panel are all about marketing, so things may be false on their only to attract sales on those.
Some people even write Refill, but it's not refillable and will avoid your tickets ... be careful, a lot of scammers in this market.