As we know the month of December has always been special for both bull run and bear matket so what's your plan for this December? Which altcoins are you going to invest this month? We need to take calculated risk since the market will either surge to unexpected level or will witness another correction phase or bearish market. I would select ADA as it has lot of potential and will surely trade in double digit.
I for one generally consider altcoins to be short term projects, thus if this question is asked of me, I'd say the altcoin I'll always pick over others is ethereum, why because I'm a long term investor, and eth is like the only altcoin that's sustainable for the long period just like Bitcoin is, however if I'm looking for short term ROI and quick exit, then I'd seek lower altcoins that are more or less pump and dump coins and maybe try my luck, this coins are very risky and you can lose a lot with them, that's why you should never forget to invest only what you can afford to lose.
Having said that, do not always go with people's ideas of the coin they want to invest in, always do your own research and come to your own conclusions, users would always pick the coins that they have in their possession and advise you to buy it, always ensure that your decision to invest in a particular coin stems from your research and believe in that very coin.