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If you solder it, remember a few things.

1.) Get a bigger torch than you think you'll need. A TS8000 with MAPP gas Heats the pipe faster and makes it easier to heat everything evenly.

2) the pipe cannot be too clean. You need to use emery cloth and/or a wire brush until the pipe surface is as shiny as copper that you just cut. Grind a piece of waste pipe with a dremel tool grinding wheel. THAT'S how shiny you need the pipe to be before you flux it.

3.) Flux anywhere that you want solder to stick. Solder won't stick to pipe that isn't clean and fluxed. Solder won't stay around forever, and will burn away if you're heating the pipe for a full minute trying to get it all hot at once. See point 1.

4.) Use lead free plumbing solder.