In a single hair straightener, you can only straighten your hair. However, 3-in-1 hair straightener can be used for, Straightening, Curling and Cramping. That's why 3-in-1 hair straightener is better than the single hair straightener because of its more uses.
There are different companies available for buying straightener.
But, according to me, Vega 3-in-1 hair straightener is best. I also have it and using it from a long time. It is reasonable and you can use it in a easy and better way. You can buy it under rupees 1500.
You can purchase it on Online Shopping App "Nykka" with 25% discount. The link to buy it is given below :
https://www.nykaa.com/vega-vhscc-01-3-in-1-hair-styler/p/178759
The quality of Power Cord is very good and has a movable cords. So it helps in the breakage of wires. The plates are different for different uses and overall finishing of hair straightener is just superb. It comes with only one switch from where you can On and Off.
It also have another "Press Button" and on pressing Curling plate will open. You can switch on to different plates with the use of that button. It is designed with the best quality materials.