I've never seen that Thomas Edison quote before. It is very spot on.
And I'll second the comments regarding the LA2A and 1176. The hardware versions of both have long been widely used and respected. I have the Sonar versions of each and I use one or the other for about 98% of my compression needs these days.
But I should clarify something. When someone says they use a specific plugin or two for 98% of something, it kind of suggests that said plugin must therefore be awesome at that particular task. And I don't think its exactly accurate to suggest that. Yes it is my opinion that both of those plugins are decent at what they do. But the main reason I use them so much isn't because of how they sound. The main reason I use them so much is because I know them fairly well. I know what each control does and where their particular quirks are. Therefore I can get the particular results I'm looking for from each of the them fairly quickly.
I could get the same results with lots of other compressor plugs, but I don't know them as well so it would take more fiddling with controls to get them dialed in. I use the ones I use because I know them and know how to set them quickly.
Like I said earlier, compressors compress its what they do. Are there specific sonic differences between various models? Sure. But in my experience, those differences are EXTREMELY subtle in almost every case. It would take a very talented and experienced ear to be able to listen to a source and tell just from the sound what particular model of compressor was used.