Different, yes. Similar? No. Is one "better" than the other? Not necessarily.
Since nothing can replicate real intercourse, the pocket pussies/strokers/mastu rbators all give different and unique sensations that a real vagina cannot. This allows them to try new things, for sure. Some of these are lots of fun, and can produce equally intense orgasms. But, a pocket pussy doesn't have eyes that stare at you, breasts that bounce as you thrust, or emotions that make sex amazing. So, they definitely lose in that department.