I2P has an attractive anonymous service design and can run applications like Bittorrent over it. But it also developed basically by 3 people in New Zealand.
Tor has more funding b/c of censorship evasion features being attractive to funders. Successes in the anonynmity feature set like SecureDrop. A vibrant academic community with conferences etc. Lots and lots of review from the external crypto and security community. A deep well of technical talent.
Both projects have designs which have inspired each other and have relative advantages and disadvantages. Technically, I like I2P, but I accept I may be somewhat biased there. Practically speaking, Tor has a much larger anonymity set because it is far more widely used and receives more support, with very well-established volunteer outproxies. I would never criticise anyone for contributing to either: Tor in particular has the widest practical impact of any tool in this space.
This distributed random idea is a very impressive achievement; I'm glad to see it work in the wild! Congratulations.
I'm not sure what you mean about "stigma". Any reasonably effective solution in such a politically-charged space as the anonymity and privacy of human communication is likely to become controversial to some degree.
Your argument falls apart the moment you claim this.