Martyn Thompson 7

Hi all,   I havent built a model aircraft for years & have just started my first build of 27" wingspan Spitfire Supamarine balsa kit.  I always used to power the kits I built with small Cox IC engines but due to the advent of highly efficient electric motors I am wondering whether to fit one of these to my Spitfire?  I apologise if this question has been asked before (probably many times!) but what is the preffered choice - electric v IC & what are the pros & cons of both?   Thanks for any assistance.   Martyn.