that is of course a personal decision- some people really like to spray baste- you do need to have ventilation= protect surrounding areas from over-spray but i think you can do it in sections which may be easier when space is limited.
i hate pinning- (mainly because then you have to work around all those pins & take them back out-ugh!
i mainly thread baste-
some people have figured out how to baste their sandwich using a dining table- do a search for tutorials on basting your quilt in small areas. there are a couple u-tube videos that show some good techniques for working in limited space.
when i have a really large quilt i want/need to baste i go down to the community center & use their floor space or tables- our public library also has a couple rooms in the basement that locals are able to use for free- we just have to call & make sure no one else already has them & it does need to be when they are open.