Have done the sea - Lhr trip a number of times over the past few years.
I have always taken the later flight except one occasion where we had to change to the following day as one of my co-workers was unwell and we offloaded ourselves as they were preparing for boarding. Bags took an age to get back as it was the night a guy stole a plane and the airport got locked down for a bit!
As others have said, the day flight is vile

little sleep and when you arrive you’re knackered.
I can’t see F being any more pleasurable than club to be honest but there is more space!