Selling it yourself on a site like eBay may get you more money (if you’re good at it), but it will be time consuming and you’ll have to learn a lot.
Selling it as a whole lot will be faster, but probably will get you a lot less money. Especially if you sell it to a second hand shop, who will be trying to make money.
Selling it through a consignment service will get you better money than through a second hand shop, but may take just as long as selling it on your own. However, you won’t have to do the work yourself, and they’ll probably be able to sell it for a higher gross price, they’ll just take their fair cut for the service.
So really it’s just how much work you want to do, and how quickly you’d like to sell it. If you have an accurate appraisal and inventory, you can see what some consignment services think about it.