I’d opt for an apex roof for the extra headroom. The security shed will be dark if you want to work on the bikes or escape from the family. Radio on, cup of tea and peace, where else would you rather be?
I like double doors, I’ve got them on my shed. I’ve put bars on the windows, but it’s a wooden shed at the end of the day, not Fort Knox. Worth paying for one with proper roof and floors, not the strawboard offerings on many cheaper sheds.
I put another floor in mine (proper floor boards) as I have a motorbike in it as well as the pushbike and didn’t want the side stand punching a hole through the floor.