Join Date: May 2004
Location: formerly Gold now Diamond, formerly MSY, now LAX, formerly NW, now DL
Programs: Hyatt Plat, Hilton Gold, SPG Gold, Delta Diamond/1MM
Posts: 4,635
So the GUCs are best value IF you can use them. If you fly AF most, be really careful of the terms of use (best to by DL marketed flight on AF/KLM and if you plan significantly ahead, you can often confirm them at booking). In fact it's just best to use them at the time of booking (via an agent on the phone).
For me, I usually do the $200 vouchers since they book as cash and count towards MQDs. But since you aren't US based, MQDs don't count so the miles might be best value as noted above.