A bit of googling and it looks to me like Filzer is a Canadian marketing company, making me suspect that the tools are rebranded Taiwanese or Chinese items. This doesn't mean that the tools are bad (and i noticed that Mountain Equipment Co-Op seems to sell them, and they usually don't sell junk), but Park Tools are sort of the benchmark of bicycle tools, and made in the US.

Cheap tools really suck, so for lack of more info on the Filzer product, i'd go for the Park, but if there is a big price difference, it's a question of what it's worth to you to try out the unknown brand and hope the quality is OK.