I think that 1♣ - 1♦ - 1♥ - 1♠ - PASS is better than 1NT. This because the most likely bid of partner over 1NT is pass, and in this case 1♠ is a better contract than 1NT. In case partner wouldn't have passed 1NT we shall get a stupid result, but making fewer tricks in 1NT when we could have made more in 1♠ is worse as this is what will probably occur over 1NT.