As others have mentioned, either way is suitable for housing your snakes. For many people, since racks are easier to set up in a way that leads to successful snake keeping, they much prefer a rack system. For others, the delight of viewing their snakes in a terrarium is more ideal, and worth a little extra elbow grease to maintain the terrariums in an aesthetically pleasing way.

I typically think of racks as the simple, efficient way to house larger numbers of snakes successfully, and view terrariums as more ideal for setting up naturalistic displays for a smaller number of snakes.

-Jen