I have a 31 deluxe coupe. It has cowl lights, a dome light, wood grain dash rail, and maybe a couple other things the standard coupe doesn't have. The engines in all coupes (and Model A's) are pretty much the same so that doesn't make any difference. The body style on 30-31 coupes, including the radiator height and wheel size, changed from the 28-29. I have heard a few people say the engine on 31's is stronger than other years, but I don't know if that is true. I think it is just a matter of preference rather than one year being better than another.