I have trouble spray basting large quilts. Smaller ones are OK. On the other hand, I dislike pin-basting A LOT. Right now I am searching for a long-armer who offers basting services with wash-away thread. So far no luck. Heavy sigh! But I will keep searching.
There is no one-size-fits-all basting method. You can use the one that works best for you. The biggest problem I have with pins is that they always seem to be in the way. Now the trick is to keep them out of the patch of your SITD and then take them out. That way you can do the FMQ without anything in the way/