The next two are pretty cool, just as original as Welowie, but Welowie has the better song writing.
Pusty Wieczor can be really strange, synths drowing out the guitars. Very original sound, the synths are so loud and then vanish, can be very odd but cool. Krew Naszych Ojcow has a lot of weird ambient things and sound effects going on as well.
But yeah, Welowie is the one you fall in love with.