I don't see a future of Reddcoin. IOTA and Sia can be good investment for long run. Much safer investments are still the major coins. If you want a quicker profit, just invest in selected pre-sale tokens (with highest bonuses). They'll yield good profit in upto 6 months.
With pre-sale token do you mean ICO? I have participated in ICO before of BAT and wthin a few seconds all coins were sold so someone using high gas price of ETH so my experience was bad...