Based on the provided information, my prediction is that Ślęza Wrocław has a better chance of winning the match against Stal Mielec. Ślęza Wrocław is currently in a high second position in the league table, having more wins and points. The team has shown consistent results in recent matches, has a low goal difference, and possesses more experience. Stal Mielec, on the other hand, is in a lower position in the table and has fewer wins. They have had minor successes in recent matches. All these factors indicate that Ślęza Wrocław has an advantage in this game and is likely to secure a victory.