I don’t think they are really competitors with TR as they are just data analysis (also it’s not really “they” as I think it is basically a project by @davidtinker rather than a commercial product). TR has been asked about including those kind of metrics into the TR calendar/progress charts before and said they didn’t want to - much as I think it’d be great if they just bought Intervals and added it into the TR system 
They’ve also referred directly to Intervals in some posts.
The reason I thought I would bring it up is because the Coggan charts seem to significantly exaggerate the sprint power compared to most people’s real experiences (as you’ve found yourself). And I am sure I read somewhere that Coggan never actually put the category labels on it; that’s been done subsequently - and as the TR guys pointed out the expectations for some of the cats are a bit unrealistic. It’s also completely arbitrary, whereas Intervals compares you against a group of your peers - although as noted there are not many peers in your age group and Intervals users in general are likely to be a bit more well trained than your average Strava user. I’m 33 so there is a much larger dataset of M under 40 and M 30-39 etc… Another reason why it would be super cool if TR merged in Intervals since it would expand the pool quite dramatically 
This is my Coggan Male:
Vs M 30-39 (5,745 athletes in group):
My sprint is obviously still rubbish but it’s not nearly as bad as the Coggan chart would suggest.
Mark Cavendish is 70 kilos; 22 w/kg for him would be 1,540 which is probably there or thereabouts at the end of a Tour stage, but doesn’t put him in the Hero category… I think you’d need to be a track sprinter to be at 25!