Thank you for posting this question. I guess this comes down to a few variables. What sort of licence do you hold, how many hours, and do you want to fly overseas.
If you have acquired a significant amount of PIC time in a twin turbine already and have your ATPL sticker in hand then in my honest opinion Sky Regional is a no-brainer.
I know jet time is not the end all be all, but I am still a firm believer that it still has some worth. If you can diversify your flight hours with Turbine, Jet, IMC, multi-crew, FMC, and PIC time that is a nice asset to transition over to Air Canada or West Jet a little easier. Especially for overseas gigs.
Another thing to consider is that both companies do not have a union, so you don't have to worry about picking union over the non union.
Really it's a personal choice and whatever you pick will work out for you in whatever you so desire future career-wise. We are in an excellent time for aviation.
Thanks for the post
If your goal is AC then hands down Sky. If your sights are set internationally then I agree Jet time is still a pretty big bonus. If you want to make the Regionals a career or even a backstop in case things go south in the next 2 years and you are writing AC off then 100% Porter. Porter is a great company and Sky is a great door opener.