I don't think Rails is any less favoured than Django - the hype moved on from back end oriented web frameworks in general though.
Rails had a higher level of initial hype though, so maybe more of that moved on to other things leaving it closer to Django that had a slower decline.
Both projects are solid mature choices though - the downside of that might be attracting enough new/younger devs. Choice comes down more to Ruby vs Python depending on which one your team knows better or if you need other libraries from that language.
Yes, Rails definitely had more initial hype, which in turn led to a bigger decline, while Django remained more steady with it's popularity. I see a lot less Rails jobs than I used to. I might b wrong but I don't see much Ruby use outside of Rails.
Rails had a higher level of initial hype though, so maybe more of that moved on to other things leaving it closer to Django that had a slower decline.
Both projects are solid mature choices though - the downside of that might be attracting enough new/younger devs. Choice comes down more to Ruby vs Python depending on which one your team knows better or if you need other libraries from that language.