Whither scale?

This week I knocked off a few 10mm models that arrived just in time for hosting a Juno Beach scenario on the weekend:

 And finally I painted a Battlefront 15mm Crusader and a 10mm Matilda - I can't decide which scale to go with for a new Western Desert project. The Flames of War 15mm stuff is lovely - but it's pricey, on the other hand Pendraken 10mm stuff is also great and half the price. Argh.....