SCSS, being a superset of CSS, is an easier transition. If its valid CSS, it's valid SCSS, so you can upgrade incrementally. LESS is totally out for me, since i

SCSS, being a superset of CSS, is an easier transition. If its valid CSS, it's valid SCSS, so you can upgrade incrementally. LESS is totally out for me, since it sometimes chokes on obscure, but valid CSS declarations (e.g. some browser prefixes and hacks).