I haven't done any crossplatform development. I assume the easiest is what you're more familiar with. If you have experience with web, then JavaScript (Cordova). If C#, then Xamarin. If neither, I would lean to JavaScript as some knowledge will be transferable to web.
>Okey, which one is more easy for development?
>
>Thanks,
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer