PBK
I guess your planning to release these Monster Sharkies , as i'm sure you know sharks over 1.5m are now protected.
50 lb will be heaps, 30lb will even get the job done for all but the biggest so you should be able to scale down you gear abit!
Both reels will hold around 700m of 50 so plenty there , i personally would go the daiwa if i had to choose between those 2!
Another reason i wouldn't go 80lb is that if you fish either reel with the correct drag (eg 50% ) neither reel will last very long before it shits itself!!!!
Ian