If you are picking up your hosereel in and out of the van all day you'll be better off with 60m, I don't struggle at all and I even go up alleys to bottom of gardens along the back of 2 houses then in to the one I'm cleaning.Depends what you houses are like, if you only need more than 60m occasionally then buy the 100m cut it off at 60m the put connectors on the 40m hose and this could be coupled up if you ever needed it
my motto is too much is always better than not enough