From what I've seen on this forum, it seems that both units have a lot of fans. The biggest difference I see is that the Protege seems to have a lot of complaints about bad switches, poor customer service, and inoperable units. Just as many say they have had no problems at all. The protege looks really nice, and I like the idea of the big button, though. Despite this being the internet, I find that if you find a complaint enough times, its at least true some of the time. Speaks to me of quality control problems more than anything.
The chuck seems to have some rabid fans and nothing but good things to say about customer service even from those who don't like the Chuck. Only downside I see is that it might not be quite as sexy and the bitty button, but no complaints of it not working. I'm assuming you might need a high voltage atty to use the 7.2 volt option? Dunno.
I don't own either, yet, I'm still pretty new, myself, and I just dropped $3k on another hobby this week... so I have to wait a bit longer before I buy something new. =) I plan on giving the Chuck a shot. I'd like to try the Protege, but am very hesitant to do so.