USA, Canada / Moving to Krakow from Canada-questions; the best way to ship my things / clothes prices [4]

Hi there, I'm going to be moving to Krakow near the end of August from Canada. Before I arrive in Poland, I will be backpacking parts of Europe. I was wondering what would be the best way to ship my things. I'm only going to be bringing clothes/shoes/laptop/, it would have been the best if I just take my bag with me, but it will be a hassle to backpack with a luggage.

Would it be better to just leave things as is, and buy it all new from Poland? How expensive are the clothes in Krakow in comparison to Canada? I'm not a flashy dresser (no designer brands), I do like slim fitting clothing though. Also, how expensive are electronics there as well? I have to buy a new laptop anyways, is it cheaper to buy it Poland or Canada?

THANKS!