Where you need to looking for is the following. What is your buget to spend monthly/yearly, you need atleast disk space 15gb to besure for people who might upload huge contents. Bandwith must nit lower as 50gb, i recommed to get 100gb montly. As every standard reseller do you have always unkimited features like, mysql, domains, email and so on. 99,9% uptime is very important, do also a IP test of the server where the server is located. Monthly backups is mostly default and make sure you get a reseller where you have a secured cPanel/WHM which make your clients trusting on your service, its important. DDoS protection is also usefull otherwise you can use CloudFlare who helps you to prevent your website for DDoS, most dossers look where you NS running on. And not to forget 24/7 support. Unlimited cPanel accounts is also good to have that somwthing that not the biggest problem is but its better to have that because some reseller offer 25 cpanel accounts and then you must upgrade to a bigger plan for mostly $4 a $5 per upgrade but if you have one with unlimited cPanel account is always better. If you have 100 cpanel accounts is also good. I rather always unlimited then you not need to upgrade fast.