Not necessarily — thicker isn't always better when it comes to chamois padding. A pad that's too thick can cause chafing between your legs and may not sit well with your saddle's shape and width, leaving you more uncomfortable than a thinner pad would.
For racing and shorter rides under two hours, a slim 3-6mm pad gives you freedom of movement without unnecessary bulk. The sweet spot for most riders doing 2-6 hour rides is 8-13mm, which provides solid cushioning without feeling restrictive. If you're into endurance riding, bikepacking, or have significant saddle sensitivity, then 14-18mm pads offer maximum cushioning for long hours in the saddle.
The key is matching pad thickness to your ride duration, saddle shape, and personal comfort needs rather than defaulting to the thickest option available.