I would think so.
the 16GB drive is also a Solid State Drive (consists solely of chips, does not contain any moving parts like normal drives, the 120GB drive in the Acer is a Rotational/traditional style Hard drive)
so basically if you accidentally dropped the netbook (obviously from not too high up), the Dell would better survive than the one with sensitive moving parts.
supposedly also netbooks with SSD drives are supposed to use less power, longer battery life due to lack of a motor for the rotational drive & all that. as well as a bit faster data access too.
but for the uses you mention, the 16GB model sounds like it would do the job. if for whatever reason you did download images & sound & video to it, you should be able to connect it to a desktop system or wireless network & download the data to another PC (or even USB drive if it has a USB port on it), to free up drive space.