I think if the projects are really good enough, then I will buy the token at the presale because the price will be in a cheap price and sometimes we can get bonuses. but I think it is better to wait after the ICO is launched the token in the market because I see that on average, every ICO is getting down after the token is released on the market so the price will be lower than the presale price.  I recommend that you pay attention to EON. http://eontoken.io/