The house edge that you're going to find in slots is simply too high especially if you compare that house edge against the one that you find in dice, while we are talking about online casinos this also applies in physical casinos and it is why when you got to a casino you will see many more slot machines than any other game and that is because slots are way more profitable than any other game in the casino, which means that if you want to maximize your fun and the time that you gamble you should avoid slot machines as much as you can.
This is the main reason why I prefer Dice over Slots. Dice has one of the lowest fees in gambling, lower than Roulette or Slots. When I am just trying to get some quick double ups I always go to Dice games because it's just the closest you can get to a 50% chance and payout to double your investment. To be honest I also think that the most people gambling online are actually using Dice games and Slots.
Slots can still be fun sometimes, but mostly only when they offer some kind of bonuses on top. Like a daily free spin or something.
I think the same, even if my favourite gambling game is poker sometimes I do not feel like thinking that much and I always have to decide between playing dice or slots and I have always chosen dice, while slots look like fun and I have no doubt that are people that will prefer that game over dice the house edge is so high in slots that it doesn't really make a lot of sense for me to play slots when I can get the very same fun out of dice for way less money.