What sold me on something besides the Frontier was "kicking the tires"...actually seeing the RFMs side by side and comparing the gauge of the deck, quality of components, etc. I ended up with a Farm King 72" RFM which was less expensive, had heavier components and a scuff roller, which the Frontier lacked. The Frontier had solid tires but that was probably the only advantage I could find, and where I mow punctures aren't a big problem. My dealer has the Farm Kings painted JD green from the factory so that sealed the deal...with the yellow safety stickers it's a perfect match!
If possible I would recommend the side by side comparison, it makes it obvious which is the heavier unit and which seems to be of higher quality in materials and finish. Good luck with your decision.