You cant really go wrong, IMO, 3711 is a great yeast for blending. But it is also great for use as a sort of secondary yeast to help supplement anticipated lacking characteristics (like attenuation and body) in beers where its fruity character wont be out of place.
I feel it can be a bit boring by itself though. I've had more than one occasion where I try a saison at a new brewery and instantly asked the brewer if they used 3711 and fermented it cooler. For me, its too "clean." When I say clean, I dont mean like how you would describe US-05, which doesnt leave its unique stamp on the flavor of the final beer. It definitely tastes like a saison yeast. But the flavor is a bit 1-dimensional and the finish it too clean and just kinda falls right off. I'm not saying you cant make a great saison with just 3711, im just saying usually i would want some hops, spices, high temp fermentation, etc to give the final beer a bit more character
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So for blending, i've probably used this yeast more than any other. It works well for me co-pitching in farmhouse ales or delayed smaller pitches in stuff you want super dry. For saisons, I've tried using it with WLP565, WLP566, WLP585, YB Wallonian Farmhouse, YB Belgian Dry, Omega Hothead, INISBC-291.
My 2 favorites were in combination with Hothead and Wallonian Farmhouse, but really anything will work. The hothead one was all fruit and i used some fruity nz hops on top of that. The wallonian one was ridiculously dry and had a nice mix of lemon and earthy ginger spice. I'd say wlp565 would be the classic combo which would be the easiest to get.