I've owned both, and while both work well, I personally think that the overall build quality is better with the Paragon.
Probably the biggest difference to me was/is the customer service......every time I tried to contact Evenheat, I always had to leave a message and wait for a couple of days for a reply, and in some cases they never called me back.
With Paragon, I've always had a real person answer the phone, and have only had to leave a message once, and that was with the parts dept. which called me back within 10 mins. Even when sending emails, Paragon has always replied to mine the same day. I'm sure "mileage will vary", but those have been my experieces with each.