The arp's are stronger and reusable. On the other hand like someone above mentioned you cant pull the heads in the car. Soooo a quick few hour pulling a head, swapping heads, etc job now turns into a bigger mess all bc some studs. So in the end its up to you.
As for the price of the ford bolts theyre cheap. You can get the FMS head change kit for $100-110. Comes with head gaskets, head bolts, and few other misc things. If youre thinking "well I dont need the whole kit"...well thats the cheapest way to get them for the most part considering what you get for the price you pay. You can get the off the wall felpro bolts for $40 or so a set from the parts store, not sure what oem goes for for just the bolts. or you can pay 20-30 bucks more and get gaskets and all, even if youre not gonna use them it dont hurt to have extras