Watch this video, and you will have the answer.

In my experience, the jump from 60Hz to 144Hz is much more noticeable than from 144Hz to 240Hz. If you're currently on a 60Hz monitor, I'd definitely recommend upgrading to 144Hz. The smoother gameplay is a game-changer, especially for fast-paced titles. However, unless you're a competitive esports player, the difference between 144Hz and 240Hz might not justify the extra cost for most gamers.

Here's my take on it:

1. Perceivable difference: The jump from 60Hz to 144Hz is much more noticeable than from 144Hz to 240Hz. While there is a difference between 144Hz and 240Hz, it's more subtle and some players might not even notice it.

2. Hardware requirements: To fully utilize a 240Hz monitor, you'll need a powerful GPU that can consistently push 240+ FPS in your games. This might require a significant investment in your gaming rig.

3. Types of games: For fast-paced competitive games like CS:GO, Overwatch, or Valorant, a 240Hz monitor might give you a slight edge. For other genres, the benefits may be less pronounced.

4. Diminishing returns: There's a law of diminishing returns at play here. The difference between each frame at 240Hz is about 4.17ms, while at 144Hz it's about 6.94ms. The improvement is there, but it's minimal.

5. Cost: 240Hz monitors are generally more expensive than their 144Hz counterparts. Consider if the price difference is worth it for your needs.

My recommendation: If you're a casual or semi-competitive gamer, a 144Hz monitor is likely more than sufficient. It offers a great balance of smooth gameplay and cost-effectiveness.

If you're a highly competitive player in fast-paced esports titles, have the budget, and a PC that can push those frame rates, then a 240Hz monitor might be worth considering.

Ultimately, it comes down to your personal preferences, budget, and the types of games you play. If possible, try to see both in action before making a decision!