Dept. of Homeland Security specifically states REAL ID is not an acceptable document for crossing into Canada. (12th question in the FAQ list)

https://www.dhs.gov/real-id/real-id-faqs

14th question says you still need a passport for international travel.

16th question lists states with Enhanced Drivers Licenses (which are acceptable for border crossings), and PA is not on the list.

A passport document is required for all international travel. You do have the option of obtaining a Passport Card for land/sea border crossings to Canada/mexico, Bermuda, and the Caribbean. However, that card can't be used for air travel. Just keep your passport renewed.

https://travel.state.gov/content/travel/en/passports/need-passport/card.html

Important caveat--EDLs are acceptable documents for ENTERING the USA. You'd have to check with the Canadian government about whether you can enter Canada on an EDL. A number of private websites say you can, but the official English-language Canadian government website lists it as an option only for Canadian citizens. Oversight? Seems likely, but not guaranteed.

Get a passport and a passport card.

The card was designed specifically for people who make frequent land border crossings with Canada or Mexico and don't want to carry the full size passport.

You can get just the card. But if you're going through all the trouble, might as well get the passport as well unless cost is an issue or you have another compelling reason not to.

Passport card or passport for driving over the border.

Get a passport like others are saying.

But I'll also add looking into NEXUS. It's the US/Canada trusted traveler program and is awesome. $50 for 5 years gets you TSA Pre, Global Entry, and NEXUS which is Canada's version of both. You skip airport security lines in the US and Canada, and lines at US and Canada customs at airports and border bridges. There's even a NEXUS only bridge in Buffalo. You save a lot of time and you get TSA Pre and Global Entry both for cheaper than the cost of one of them.

Only caveat? It requires an interview, and they are only done at the border. So you might have to schedule an appointment and run up to Buffalo. Also not sure what the current wait-list is after COVID really screwed up the process. And you need your passport first, so get that.

Agreed. The card doesn't work on flights. I don't think it's worth the cost, just get a regular passport.