The ways in which the generic codes the conventions of science fiction are used in 'The Day The Earth Stood Still' and 'Independence Day' are very different. The main factor is that both films were made in two different times. 'The Day The Earth Stood Still' was made in 1951, so it doesn't have the massive amounts of special effects as in a film today and it is also in black and white. 'Independence Day' was made in 1995 and in that time were a lot of action films being made with very high quality special effects. Both films have...
warning, in 'Independence Day' the tagline is that the aliens will do anything to destroy Earth and that we only have ourselves to blame.

One major difference between both films is that 'Independence Day' has a larger budget at the time it was made there were a lot of computer graphics in the film, these almost help the film to be more believable to the audience. Whereas 'The Day The Earth Stood Still' was made in 1951, that was 45 years before so of course the special effects wouldn't be as good as a film made today.