Similar sizes visually.
Caution: Merckx owner doesn't know how to change a flat.
Buy the one that 'feels' right on a ride.
2) liquidity = ???? Why changing bikes so often; find a couple (or more) you like and stick with them for a while. Unless it's a profitable side hobby.
on a separate note - Shimano made the ugliest integrated shift/brake levers a human could image.
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Vintage, modern, e-road. It is a big cycling universe.