After seeing hundreds of take offs of mostly F-15's and FB-111's, I have to say the FB-111's evening and night take offs looks better. The FB had a much longer flame, about 3 times as long as an Eagle's, (of course they needed it to get off the ground) and a wider range of colors. Not to say the F-15 wasn't impressive.
For that matter, just seeing one of the damn things in the air was a sight to behold. The Viggie is perhaps the most beautiful airplane ever built, IMHO. A bitch to land on the carrier, though.