The arguments so far say that Trotsky was more important to Bolshevik victory in the civil war. So, I'd like to hear some opinions on these:

1) Lenin presided over the Supreme Council Of Defence and, from there, he had direct control over the Red Army outlining policies that regarded the conduct of the civil war.
2) Lenin knew the civil war was coming and had planned thoroughly for it. He was easily the master strategist in the Bolshevik campaign. For example, he was behind the Land Decree Act, allowing peasants to do what they were already doing (removing landowners and taking land, right?). Although it didn't guarantee the support of the peasantry, it was a decent start and, compared with the brutality and intentions (return to Tsarist autocracy) of some White troops, made the Reds seem the lesser evil.
3) It might even be fair to say that all of Lenin's major policies from the October Revolution onwards had the civil war in mind. The Treaty of Brest-Litovsk (something Trotsky was strongly opposed to) allowed the Bolsheviks to build up and prepare for the civil war and it's fair to say that the better preparation and organisation of the Red Army was a key reason for the victory.