I use Log4OM V2 - which is not one of the options for this survey. I would use LOTW, but the ARRL makes it so difficult for non-US stations to register that I have simply not got round to it yet... Martin (G8FXC)
With a new year, a new QTH, and the old paper log book running out of pages, I've just gone over to a text file I keep on the computer's desktop. Same format as the paper log, but at least it'll be easily searchable now.
QRZ free It's web-enabled and you can convert the logs anytime you want to others I'm going to look to call up every time on QRZ anyway so why not just log it using qrz EASY And I have it on any device that has internet
I still have a couple more pads of the big logbook pages given away by Svetlana at Dayton, years ago. I bought some tubes from them and they gave me a stack of pads already 3-hole punched. I've used 7 or them up. Also I log QSO's to the QRZ logbook sometimes too. Generally I always send a paper QSL card with an SASE for my USA QSO's. I don't do contests of DX-peditions so don't have to worry about those QSLs. I still have a huge box of my VP2EHF QSL cards which were answered by my QSL manager at that time.