Riskbreakers said:IMO, it matters more on your general deck (deck choice in general rather than the decklist itself). I am always a firm believer that the computer is usually your biggest enemy in a large scale tournament. I'd rather have the skill difference tip the game in my favor.
Don't get me wrong, in game skills is important, but a lot of games are just filled with luck and mindless plays, to the point that you just don't get very many opportunities to outplay your opponent, but your decklist will be what you're stuck with the whole tournament. An average player with a great list will usually beat a great player with an average list, because there are just not that many opportunities to outplay your opponent. Luck and deck choice are probably the two biggest factors though.