Never challenged, slow yes, challenged no
I have never nor do I wish to compete in Brazilian Jujitsu, it is against my nature, being the cause of someone else's failure
without intending to antagonise, this does smack of hubris, so I'd probably suggest competing anyway but as a means of experiencing it rather than "to win", removing all that dreadful chest-beating at being the best..
For your original question, the answer will be unique to yourself - if you find you enjoy doing the two arts, do them. They're not in competition with each other and as long as you don't wander down the path of "but in x they do y" you should do fine. (But then I've never understood anyone who objects to cross training.)