Day-Night
The advantage of night crossing of the channel afforded concealment from the RAF and daylight to disembark and deploy - exactly as the case on D-Day.
The disadvantage of a night crossing was the risk that the RN, freed from threat from the Luftwaffe, could wreak havoc with the invasion fleet.
The tactical problem was to balance the risk.
A day crossing meant the Luftwaffe could counter the RAF and threaten any RN attacks.
Clearly the influence the RN could bring to the invasion depended on whether the Germans attacked by day or night. For my money s day crossing offered more advantages.