IFR from CQX (Chatham, MA)

I see that CQX has a clearance delivery frequency, so IFR ops there
apparently don't require a phone call to FSS (excluding the filing, of
course).

But when IFR out of KCDW, I can expect release delays because CDW
departures are treated with lower priority than TEB, EWR, and probably MMU
departures. What kind of delays would be expected departing from CQX?

I'm trying to decide, assuming the weather permits, if I'd be better at
CQX (more convenient for me) or HYA.

Thanks...

Andrew
http://flyingclub.org/