This is probably a beginners question but what is the difference in a recipe between an IPA and a saison? I'm not a fan of IPA's but love saisons. The are both very hoppy but in completely different ways.
yeast & fermentation temp has a ton to do with it. that and I think most Saison recipes use Belgian Pale or Belgian Pils malt as a base. also, traditional Saisons would use French/Belgian/German hops as opposed to the American fruit/pine bomb hops or the IPA/Pale associated English hops.
Saison is all about the yeast. IPA is all about the hops.
Generally saisons are fermented with specialty yeasts at very high temperatures so that the characteristic flavors of the yeast floral to funky come through
IPAs are generally fermented with very neutral yeasts at cool fermentation temps and are quite dry. All of the interesting flavors of an IPA come from the hops used.
Grain bill for both can be quite similar but hops and yeasts will be very different.