New Trend of 30mm inner rim width worth it? I am building up a bike and have my sights a particular wheel.

I am able to get the same exact hubs in either 25mm or 30mm internal but am able to get a pretty good deal on the 25mm.

I am going to run a 2.35" tire up front and a 2.25" on the back.  My question is the benefit of the wider rim worth the price increase for the tire sizes that I'll be running?  25mm is the widest that I have ridden but I do see the trend just keeps getting wider and wider.