If it’s a going to be used as a true all round machine, ie taken to a proper DH track as well as XC tracks then I would recommend a 456.
The slack head angle and its stable manners make it very good descender. But the low front end and long front centre enables to you get back up the hill without too much trouble either.
If it going to be mainly used for XC and trail centre stuff then I’d probably say there are better frames about.
The C456 is good at everything but is not amazing at anything. Something like a Soul would prob be better trough some single track but then a Soul wouldn’t be as light and let you descend a well as the C456.
I love my C456 but it does get used for a bit of everything and I don’t think many other frames can match that ability. Other frames may beat it in their own niche’s but not across the whole range of riding.