There are always pros and cons to every choice but in this case a little research up front may pay dividends!
If there items people will want and you can get good money for I would sell them separately because in most cases you wont get any extra or very little with them on the bike unless the bike is nothing special and these parts are the selling point!
You need to find out what is on the market in your general area and gauge either way if you will do well complete or better off splitting the parts!
And ultimately if you can't be bothered or time poor then you have already made up your mind!
Cheers.