What is the biggest difference between the two and if any which is better to use for webpages.. (.php .html .css .js etc..) Any help with this would be great! I've been trying to gain a concrete understading by searching, but haven't had any good information of a comparison. Any information I've gathered has been from years ago and I was looking for an up to date opinion! Thanks again

PS- I've also heard talk about ISO but again have no idea.