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I would be tempted to say that the rapid hitch is better. The pin going through the slider has more surface area to displace load than the pin on the other hitch. A buddy of mine has the 5 1/4" drop rapid hitch and it looks and feels very solid. I have pulled with it and was very pleased, even on the lowest drop, and in the time he has owned it he hasn't had any problems with it.
That's just my opinion, interpret it however you see fit. These hitches are pretty spendy, so choose wisely.
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-Nick
My Daily Driver:
1986 F-250 2WD, Regular Cab, LWB, 6.9, T-19, Sterling 10.25", open 3.55's, XLT Lariat, Texas Sesquicentennial Limited Edition, No Restrictor Plate, manually switched high idle/advanced timing, and an awesome custom shift knob thanks to Bruce Roosa / Koolknobs. 
279,000 miles and counting, hoping for a US Gear OD and a Hypermax Turbocharger one day.
My first truck:
1982 F-250 4WD, Extended Cab, LWB, 5.8, C6 to T-19 swap, BW 1345, Dana 44 TTB/Dana 60 Semi Floater, open 3.55's. About four different colors (not counting rust), currently on loan to my little brother. Maybe one day it can be home to a 6.9L too.
Work Truck:
1992 F-700 Flatbed w/ dump, 7.0L BIG BLOCK GASSER, 5-speed trans (Clark?), 26,000 lb GVWR. Rides like a tank
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