tried both UB's and CA's naan with the same meal. i cooked both on gas BBQ and therefore can't comment on results for hob.
i did put the egg and 2 tbsp of caster sugar in both. i also did not mess about on the making side (powers in, liquid in, mix, knead).
the testers knew there were 2 types but could not distinguish between and said "naans were fine" (their definition of fine being not bad at all).
i favoured UB's as i think a yeast base gives a nicer taste. i'm not 100% sure but think the self raising flour gives more of a pastry after taste.
i personally did not think there was not sufficient difference to change from normal KD recipe though.