> is it better than ipad?

Only you can answer that, “better” is a personal choice. A dedicated e-ink reader does less than an iPad (some see that as a bonus, others as a disadvantage). E-ink colours aren’t as vibrant and devices are slower, but the battery life, weight, cost, and reduced eye strain can more than make up for it.

If possible, I recommend grabbing one at a store nearby and playing with it a bit. You’ll soon understand if the weight, speed, and colours are enough for you.