There are no fixed criteria for that. But probably, all are good enough. Start with one that scores consistently high on diffferent review sites, especially on points you find important. No need to be confused.
I am searching best vpn for netflix i watch almost more than 10 websites every websites have different rating criteria but mostly sites are almost same top 5 only 2 sites i am watching those rating similarly different cnet.com tells 1st one is nordvpn and another site tells expressvpn 1st one i am confused please suggest me which one is best and why