These are all decent companies when it comes to amps. I've owned amps from all three. Go with whichever one is cheapest and powerful enough to power what your trying to power. MTX and RF amps are definately built cleanly and tidy inside. I've never opened up a JBL amp but never had any problems with the ones I've owned. All three always put out more than they are rated for (MTX and RF will come with birthsheets. JBL you'll just have to believe me.)