I am currently using a Jepp CR-3, but I'm working on my Christmas list and
I'm wondering if I should add an E6B.

Does one have any advantages over the other as far as real life, training,
exams, go?

As a separate issue, I am also looking at the Jepp TechStar, the CX-2
Pathfinder, and Sporty's electronic flight computers.

Any recommendations?

TIA