Honeymoon trip in dec, Bali or Sri Lanka ?

Its going to be my 1st international trip…me and my fiancé are confused between Bali and Sri lanka …Idk if bali will be too crowded in dec ?? Sri lanka still looks untouched as most of the people prefer bali… i dont want to make my honeymoon hectic maybe save bali for next year ?? Also Seychelles is 3rd option …