Like said - CF is more advertised and has better brand. People honestly think that strongmans are fat bear-like mens ie. heavyweights. I don't have anything against with any weight class, but it is clear which one seems more "cool" to the big audience.
There is a downside too - this is why it is called crosshit. People with none or too little experience try to amrap cleans or do demanding bw circuits etc. So you should have a good base anyway. No matter are you going to do strongman or CF. One crossfitter once said to me that one should have 3-5 years of lifting (and O-lifting) experience before he/she would be permitted to enter the CF gym. Of course this wont never happen, since money is always money.
PS. I personally prefer watching strongman over CF, but find the latter interesting too.