I also agree that Poland will beat Wales but it will be tough especially as Wales are quite stubborn and with Poland having the advantage of most of their players present, it will be difficult for Wales to penetrate them when they meet on the 26th. Poland are just above Wales with three points and I know that eyes will be on both Robert Lewandowski and Gareth Bale to deliver both their teams. I'm also in favor of Poland winning that game by a slim margin.
As usual, everyone is underestimating Wales, and they have their reasons. In the 21st century, Wales has played against Poland six times, and Poland has won all six times. However, we shouldn't underestimate Wales; they are a talented and spirited team. So, the upcoming games will be tough, with both teams at a similar level. Still, Poland has the advantage, and I'll bet on Poland favor.