Not all slots feel the same mentally

Some games are super straightforward: classic layout, clear paylines, maybe one simple bonus feature. You spin, you chill, you don’t overthink. Then there are the modern chaos slots. Cascading reels, bonus buys, random modifiers, multipliers on top of multipliers, mystery symbols, three different bonus modes… sometimes I feel like I need a manual just to relax. So, which slots feel more relaxing to you? The simple ones with clean rules, or the complex ones packed with features?