omeone did a test with IE and FF. They went to pr0n websites and crack websites and common websites like google. They did this for 30 minutes. Afterwards, they did a Spyware test.
For the IE, the found 800 Spyware threats. For FF, mearly 88. (or something like that)
Its like, "okay, your gonna be going over here and doing this. ANd wait, there will be a gunship and some soldiers. then youll blah blah blah blah.... etc"
And youll do exactly what they say! when hl1 was like, "your gonna go here! go go go go!"
You have no idea whats gonna happen.
But i would go with HL1 in teh source engine. And better models and textures to go along with it.