The never ending saga: paint on canvas or on plywood

I have canvas on a roll, I have all the tools like a mitersaw and even a compressor with brad nailer. But this time, I needed to make some paintings fast for an upcoming presentation, so I had to buy. I bought a Lefranc Bourgeois canvas 100% Linen size 60cm x 120cm, price 58Euro, that's like $70. I think that's a hefty price to pay for canvas. Okay, it's the best quality out there but still. For an artist budget, not knowing if you will ever sell this painting, it's a lot to spend. Made me think again of using plywood to paint; there are so many advantages, it's cheap, strong, doesn't warp or stretch or sag like canvas, and when the surface is prepped well, you have a super finish in your works. It's certainly something I will look into. Of course the prep work is going to be time consuming, priming & sanding. I will try it out anyways, I'm sure the result is going to be awesome.