In getting ready to hang the drywall for my basement and just need a
few clarifications. I thought you were supposed to butt the sheets
together but I have been reading some articles that say to leave a
1/8" gap between them, which is correct?

I was planning on hanging the sheets vertically, do you really cut the
number of seems in half by going horizontally? Is one better than the
other? The walls are 14.3 x 23.7 and 9 feet high( I'm installing a
drop ceiling so not going to the top is not a concern)
Thanks
John