If i have 10K to invest alt-coin good for 1 week, Based on the popularity and demand i'd rather choose these two, Bitcoin and etherium because these are the types of coins which are famous and delivered good performance based on its history chart:)
That's a terrible way to go about a 1-week trade. Bitcoin and Ethereum fluctuate greatly within one week and right now there is no signal for any major bull runs.
You're much better off finding a coin that is about to multiply due to upcoming news and updates, like Waves which will be $30+ by Friday.