HC-128 and SOSEMANUK are two stream ciphers that were studied by the "eSTREAM" project. A bunch of candidates were evaluated, and the "best" (in some way) were kept in the final portfolio.
From the eSTREAM project page, you will find a lot of information on these algorithms, including full specification, reference code, test vectors, and design descriptions. There are also links to benchmarks.
The point of making you write a table that compares parameters for these algorithms is, indeed, to have you read these documents and understand what parameters are relevant. Ideally, you would go beyond what is already documented to take into account some newer research (e.g. while SOSEMANUK is really fast in software, the natural implementation will use a lookup table with state-dependent addresses, which is a bad thing with regards to side-channel attacks; a fair assessment of the algorithms should discuss such things).