For my next cycling vacation I am evaluating the possibility to locally renting a bike instead of taking mine along: the costs are equivalents and I would save the hassle of carrying the box around.
The rental services I am exploring offer either city/touring bikes with flat bars or cyclocross/road bikes with drop down bars, while I normally ride on flat bar.
Is it advisable to keep the same bar style on the rental bike, or "muscle memory" and other stuff will not be a problem? I'd gladly avoid settling problems while riding 100+ km/day.
Additional info: I am looking to cycling in Japan, Biwa lake and Koyasan. Therefore paved roads but hilly, not really away from civilization, but still with some roads among the mountains.