To compare pretty standard 6hit Naglering vs. 7hit Rag: (assuming all other gear is the same outside of STP adjustments)
23 STP for Naglering 6hit: /SAM 15, Rajas 5, Rose Strap 4
30 STP for Ragnarok 7hit: /SAM 15, Rajas 5, Rose Strap 4, Aurum Cuirass 7
Which pretty much boils down to dropping E. Body for Rag Build - losing 2 STR, 2 DEX, 15 ACC by having to use Aurum.
Naglering Advantage: 6 Hit Build, 21-22 extra ATT, 2 extra STR, 0/+1 ACC, 2 extra DEX
Ragnarok Advantage: 1 Base Dmg, 2.5 Proc, x% extra crit hits.
So you've pretty much just paid ~180-200M for 2.5 Procs and some extra crit hits while getting to 100 TP slower and doing less WS dmg overall.