Both are good, durable choices.If you are doing this work yourself, a tub with a surround may an easier installation choice, since there are fewer parts vs. tile.
However, I am partial to the look of tile. We recently installed a Mauicast tub for our boys.
- The bathing area is 15" in depth over 2" deeper than the standard 5' bathtub, which is nice.
- It weighs only 100 lbs. which is easy to transport and install vs. cast iron.
- It has great heat retention.
Our surround is made from white 3"x6" subway tiles with a glass mosaic band just below the valve.
Another good alternative is a Solid surface surround, like Corian or similar product. The three smooth panels make for fairly easy installation and sealing of the corners with low/Zero VOC adhesives.
Good luck with your choice,
For more information:
Read "I am having trouble finding information on companies that manufacture tub surrounds/walls that are made of low-VOC materials." a Q&A answered by Molly McCabe.