PCS-Electronics

I'm trying to decide which transmitter to buy, but I can't tell any differences between them.

The new MAX PRO 2015+ FM exciter is a simplified version of our MAX PRO 5015+ board and also a replacement for our old MAXPRO2000+. It is also a recommended replacement for our popular MAX PRO 3000+ board. Although this version lacks some of the features of the MAXPRO5015+ it still represents a big improvement over the old MAX PRO 2000+ and MAXPRO 3000+

So what features is the 2015 lacking? The specs are the same, right?

2015 does not have digiamp connector, but it does have 2 inputs for external swr and pwr reading from directional coupler in case you want to use an amplifier/pallet.

So if you are going to use this as a stand-alone product there is basically no difference and 2015 is recommended and a better deal.

2015 has one advantage, it can be used without LCD module further decreasing the cost. You can find MAXPRO2015 here:
http://www.pcs-electronics.com/max-pro-2015-p-2315.html