It greatly depends on a variety of factors. All three of my Fords call for ILSAC rated 10W-30 in the regional maintenance supplement, overriding the standard American one calling for 5W-20 for the Expedition and the Grand Marquis. The GMC Envoy explicitly calls for ACEA A3 in the regional maintenance supplement, whereas the American manual calls for ILSAC/GM6094M rated 5W-30.
I'm going to rule my Grand Marquis out, given heavy modifications, but I use ACEA A3/B4 as a baseline. I have a lead foot, with all my engines seeing 3,500+ RPM regularly and consistently on the highway - including the Explorer which has a 5 speed 5R55E. My Envoy, Expedition and Envoy all have locking 4.10 rear ends and the Grand Marquis, a Torsen T-2 3.73. The Pajero has a 4.56 rear axle ratio, and that one in particular sees 4,500 - 5,000 rpm very regularly, sometimes for an extended length of time. This, combined with 130 + F weather in the summer season, I see zero benefits to using ILSAC rated oils and that's my own justification. With the exception of the Grand Marquis and the Envoy, which run Euro V, the rest of my fleet runs on Euro II gasoline with high sulfur levels and that's something else I consider. Personally, when I buy oil, I look for MB-Sheet 229.5 approval over anything else.
Worthy of note, the Lexus ES with the 2GR-FE calls for 5W-40 in this part of the world. Whilst it has nothing to do with reliability, you're not going to hurt anything running a heavier xW-30 or xW-40.