If the OP is thinking of chasing podiums and licence points for national ranking, taking DH racing a bit serious, then get a DH bike.
Depending on variables of track-V-bike-V-rider then some gifted riders will do well on most bikes.
In theory a DH bike will be built to take some serious abuse, and really need ragging hard.
An Enduro bike, some are very capable at DH, and offer a very lively ride, and can feel more exciting as you are on and beyond it's limits more than a DH race bike.
An Enduro bike will deal with so much, but it will show the wear and tear faster as well.
Saying that..... not uncommon to see snapped DH bikes, mostly of the very lightweight frame design.
If just doing the odd DH race now and then, then if you only have an Enduro bike, few tweeks and race that