The Screwdriver is proven. It's been around the longest and is a solid performer. Trog has steadily made improvements to the battery connector to accommodate the variations in atomizer fitments and it has had no issue with any atomizer I have owned.
The Prodigy is unproven. In the 24hrs I've had it I love it but I've loved most of the e-cigs I've had for at least the first week or so. Then the issues begin to appear. Stuck switches, or bad paint or what have you. In all fairness though the Prodigy does have a warranty to cover those issues.
The Screwdriver and Prodigy really shouldn't be compared to each-other in my opinion as the SD is 3.7v and the Prodigy is 5v and the experience of those voltages is pretty different. 5v alters the flavor some but without becoming harsh and the rapid
juice consumption as found in 6v
devices, which my experience is limited to only a home built mag mod. That said there is a noticeable increase in the
juice consumption just not as severe as with 6v.