Schweser has been in the CFA provider business for decades. Wiley’s material is based off a provider they bought some time back (Elan).
I am quite familiar with Schweser’s material as they are one of our partners – they do spend a lot of time, budget and effort in updating their material so you always do get material most relevant to your exam. They are also the most widely-used provider.
Some candidates’ criticism of Schweser is that it doesn’t 100% cover the CFA material. But that’s a feature not a bug: the Schweser material tries to summarize everything and covers everything they believe is necessary to pass, so candidates don’t ‘waste time’.
Personally less familiar with Wiley’s products, but have observed that it can be outdated, especially L2 and L3 material.
Hope that helps!