The beaches are nicer on Antigua. It's a lot more rural as well. Many of the hotels tend to be All Inclusive because it's a pain to drive around at night. Antigua is also quieter and more laid back than SXM. There's only 1 casino in St Johns. It attracts many cruiseships, yachters and sailors so in that respect it's similar to SXM. I would also say that there is more visible poverty as well although we did not feel unsafe. It does retain a certain British flavour and many of the tourists are Brits and Germans. English Harbour and Nelsons Dockyard are highlights of the island and there's a rich history. It's not as easy to see other islands but you could do day trips to Monserrat or Barbuda if you wanted.