I would definitely choose diana regardless just so as i have a snooty in my town (but i just like having all personality types personally)
Between teddy and julian is super difficult...I recently fell in love with teddy as he was my starting jock villager and he's super nice. but then julian is pretty unique. Even between matching aesthetics with your other villagers...teddy would fit with the majority of more natural colours you have but then julian fits with more bright coloured villagers like audie and marina and diana.
Ok just making the hard cut with personal bias lol, I'd pick teddy and diana
I would cut Teddy, just because 3 jocks seems like a lot. I have 2 in my town and I do like them both, but I'm sick of the dialogue. Plus, you don't have a snooty on the list, so Diana would fill in for those personalities.
I have to agree that Julian doesn't fit the rest of the villagers. Besides, you already have a smug, Kyle.
But if you don't want 3 jocks as mentioned above, then I guess you have to go with Julian and not Teddy.