I haven't read the rest of the board ((I'm not being ignorant, just lazy, my apologies!)), I just thought I'd share my two pennies.
I've been using sand for Dude and Girl the majority of this year. I've used paper towels and tiles before and I think the choice to switch to sand was purely for appearance. ((Don't fuss at me yet, folks.))
I think that if you're -careful- with it, sand shouldn't pose a problem. It -can- be a problem if you're irresponsible with it, such as putting babies or even juveniles on it. They tend to be very curious and want to lick things. When I put sand in my beardies tanks, I kept an eye on them like a hawk for several days ((not too hard, they sat in the same room as my computer)) to make sure they weren't getting 'curious' about it.
I also made absolutely certain to feed them outside of their tank. This included vegetables and feeders. I will admit that I experimented at times to see if I could find a bowl/dish deep enough to keep sand from being a problem while still allowing the beardie to feed, but I found that even if it was, beardies loved to tromp around and drag the sand with them wherever they went so sand got in them anyways. The experiments always failed.
For poop removal, we used a wide sand shovel and basically scooped out the poop and all sand around/over/under it as well to minimize any chance of bacteria becoming a problem. Because of this, we ended up replacing the sand quite frequently and that was getting to be -expensive-.
That was the factor that made me switch back to tile.
Girl's new tank is lined up with tile and so far she is
loving it. Her tank could fit two squares width-wise comfortably but the third was an inch over, so we ended up making the entire back part of her tank a ramp which she really, really seems to enjoy, especially since she's now near a window and will spend all day looking outside from the vantage point the ramp gives her.
Dude still has sand, but his tank is next for renovation.
Just thought that'd share that sand, when proper precautions are made, isn't always a -bad- thing, but the sacrifice is being extra cautious, extra careful and willing to follow a certain set of protocols and responsibilities that come with it. At least, that has been my own, personal experience with it.
But yes! Tile and repticarpet and non-sand/loose substrate types are always the better choice!