I believe the switches themselves don't make much sound, it's more the keycap smashing with the body of the keyboard that makes the *thud* sound. I could be wrong.
Which is better for typing? I hear people saying tactile is better since you don't have to push bottom compared to linear which makes it less tiring than linear. On the other hand, some people say that linear is better because it is smooth and doesn't have the bump so it is less tiring than tactile. Which one is more practical for typing?
"I hear people saying tactile is better since you don't have to push bottom compared to linear which makes it less tiring than linear." Partially true. Mechanical switches have an actuation point / travel distance of generally between 1.5mm to 4mm (bottomed out). However, you can suspect that the majority have it at 2mm, just halfway from bottoming out, so the notion that linears require bottoming out to register is simply nothing more than a misleading misconception. The main difference between linear and tactile+clicky is that linears don't have a physical indicator (aka the bump) that you have reached the actuation point, since it's just the same feel across the whole pressing (and releasing) motion. The lack of bump in the linears doesn't necessarily mean that the actuation point is at the bottom. Cmiir though.