As long as use the same tires, except for BSD, on 700c and 27" rims of the same make I would not expect to feel any difference. Be interesting to try a blind test though.

With the much wider choice of widths and makes available in 700c tires, at least in the USA, the only reason I would be tempted to choose 27" wheels and tires would be if I knew I was going to be touring where 700c wheels and tires are uncommon. India still has 635mm tires as the commonest size so neither 700c or 27" would be the best choice for there.