I'm a righty living in a LHD country, and I have driven RHD in fact as well (the first time I drove was a rental manual car in Scotland!). Talking about the bulk of the population (right handers) LHD alows better gear shifting but worse wheel control, while RHD allows better wheel control but worse gear shifting. I really like shifting with my right hand, but steering is more importnat than shifting in my eyes, so it only seems natural to have the shifter in your left hand in a RHD car!
Canada - RHD
(Buck the trend!)