The trade-off is between risk and reward. Higher cap coins are in general more likely to have steady growth, and lower cap is where you tend to find the x100 coins but also coins that fail.
So depending on your risk level, I would say NEO or Cardano as good high cap options, Walton or 0x as medium, and Aragon as lower cap.
I could give reasons why, but this can be counterproductive - you always need to rely on your own research.
Good question — besides Ethereum…LOL. So you mean we all love it? OK, you are right. I honestly think that NEO is great as well as Cardano and DASH. I hold Monero and deal with Ripple, EOS and Qtum.