The Cineworld in Ashford is fine - has at least 12 screens, you can book online etc. Just off junction 9 of the M20 in Eureka park.
Silver Screen should be fine though, if it's otherwise better for you. They've streamlined payments so you don't queue for long and I've never found it full up (even not for The Force Awakens on opening weekend...). Also, a lot cheaper!
I find Cineworld more comfortable but Folky has its own restaurants and cafes nearby if you want to eat too Googies does a cinema deal, burger and cinema for £10 BUT the service is always slow. Excellent food but I assume tiny kitchen so allow plenty of time