Another pickle fork advantage... depending on the model, you can get the bow ladder. I've only used mine a few times but when I do, its really handy to have. But, I'm with all the others in saying the bow has more room and the flip up seat are great for accessing the storage space. Also, that extra space on the front deck allows for a good step on/off spot when picking up or dropping off folks.
A boat like an x30 probably already has a good amount of space up front but I'd bet a comparably long boat like an x35 would feel much bigger. But in the case of x15, the cabin space is much larger than, say, an xstar which is similar in length so there are some trade offs there.
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