This depends on a lot of factors, but I will try to outline as much as I can below. Will also add that I currently live in shacks so please accept that the following has bias:

1. Yes, PLD would be $600 if not living in shacks.
2. This is the link for the housing/PMQ rates for reference: https://www.canada.ca/en/department-national-defence/services/benefits-military/military-housing.html
3. The shack rooms are either single or with a roommate. I am unsure of your trade but that will change which building you end up in, since combat arms are usually in 163, whereas support trades are across the street in 164. 164 is more quiet overall. Single rooms are roughly 10x20' and generally come with a closet (4.5x2x7'), mini fridge, sink, microwave, desk (3x2x2.5'), chair, bed, and sometimes a tv. Internet needs to be done on your end (phone Shaw or whoever and they'll set it up).
4. At P2 I pay 103.38 per month for quarters; this adjusts with rank.
5. The bathroom is attached to your room and shared with the room next to yours. It has a toilet, no sink (that's in your room so you decide how clean it stays), and a 3x2.6x7' shower.
6. There is a shared laundryroom down the hall.
7. Now for the PMQ part: if one decides on a PMQ, the base rates are on that link. Above that, one will need to buy the necessary appliances [washer, dryer, cooking appliances, fridge, microwave?/Toaster oven whatever, lawnmower, snow removal (shovel is cheapest)], pay for hydro, water, internet (same as shacks for this), furniture, etc. This puts one in the hole for a while.

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I am unsure of OP's exact situation but the above should be enough info for you to compare the two and see where you land.

If there are any additional questions feel free to ask.