"The Eliminator membrane is a non-tested membrane and still TFC with a minimum rejection of 96% while the SpectraSelect membrane is a hand tested RO membrane in which will provide minimum 98% rejection which will result in longer-lived DI filters"
That's a response from the Spectrapure rep I deal with. So outside of the 10GPD it's just the fact that one is hand tested and the other is not.
Here's a chart they sent over as well.