I realize the 60 series tire will look better since it is wider, but I prefer a taller tire. You need to be careful in keeping the tires near the same width as you currently have, so it is sized correctly to your wheel size.
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Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS
That is a good calculator for comparing the tire diameter and speedometer accuracy.
I just wanted everyone to know that I have decided to stay with the stock tire size. I have decided on Michelin LTX M/S2 tires in the stock P235/70R17 size. They are considered to be light truck tires and have the XL (extra load) rating of 2200 lbs at 41 psi. They are rated at 70,000 miles. When I get them installed, I'll post my feelings about these tires compared to the Hankooks.
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Chillbilly
2013 Rockwood Signature Ultra Lite 8244WS
2015 Ford F250 Quad Cab w/6.2 Engine