There’s a lot of ways that could have gone, so there’s no way to know if it would have been “better”.
Would Japan have still attacked the western powers? Would America still industrially support the Soviet Union?
As shown in WWI, it’s unlikely that GB would have turned its back on its commitments.
Once the United States expanded its presence in the Pacific after the acquisition of Hawaii and The Philippines, we had to rely on The Royal Navy to guard the Atlantic. That’s why we were never really “neutral” in the Two World Wars.