That's really impossible for someone else to say. what have you had in the past? Did you like it? Is it the issue of material or number/size of sink bowls? You have three materials, three styles and three cabinet choices here. That's 9 possible combinations. Everyone here has one of those combinations. I have a single bowl apron front farmhouse fireclay and the only thing I MIGHT do differently next time is porcelain over steel apron front.

I love my silgranite sink. I considered the Super silgranite, but decided on the 1 1/2 bowl silgranite because of a lack of a prep sink in my kitchen. It is a great material and looks marrrrrrvelous!

As Pinch_me already said, you need to provide more information, and narrow down in your own mind what you are looking for. Divide the question into two camps: aesthetic (fireclay apron front is an ENTIRELY different look than a Silgranit or stainless undermount), and sink-material pros and cons.

I also think it is imperative that you not make this decision "this afternoon" as you said. Sink selection is fairly permanent. Your counters will be cut around the sink. Don't rush into the choice just because your "cabinet builder is coming in this afternoon". You should, however, discuss with him the sink base cabinet size immediately. The size of your cabinet base will be key to your choice of sink. We don't know the size of your kitchen; if it is quite large, then I would say go for a 36" cabinet base. If it is smaller, you need to decide whether you want to forego either countertop or appliance size in favor of sink size, or visa versa.

We have the Silgranit Blancoprecis Super Single. Here's our decision path in case it might help you. (1) We originally were going to have a stainless sink, which is what we had before. But we decided we were tired of the water spots and dinginess of stainless sink. I am in love with our Silgranit sink which shows nothing. (2) Silgranit doesn't scratch or stain or chip. We have no worries with our cast iron pans or rough careless teenagers. (3) Silgranit is heat resistant to 536 degrees so no worries about burn marks if we set down a hot pan. (4) We like the offset drain (which you can get in some fireclay apron front sinks too). (5) Our cabinet base fit the Blancoprecis size; at 30" (interior), it is roomy enough. (6) We are "single-bowl people", so bowl choice was not a decision for us. (7) Our kitchen is transitional, i.e. neither traditional nor contemporary, so we like the undermount rectangular style. (8) The price was in our budget. (9) Finally, we chose the "anthracite" color, which is black (there are 4 other colors), because it looked really sharp with our granite, and it won't show anything.

I love the look of fireclay apron front sinks. But it wouldn't fit in the parameters for our kitchen. You need to decide what YOU want and like. I wouldn't make this decision without thinking it through at length, rather than hastily.