You can actually do both because it is a very good idea if you are into multiple investment or what they call as diverse portfolio. ICO is good because when you invest during the presale or during the main sale, you can avail its bonuses. Volume is essential in investment because the greater the volume you get, the higher the chance of earning big profit when the token value spikes.
Each of that opportunity will bring you in advantages and disadvantages. They will bring their own risk and reward. Dont ever think too much about this. Now if you are wise person then split the money become 2 or more and you can buy bitcoin, ico product and maybe other exist altcoin.