Free does not have to mean basic business software
Wave has one of the strongest arguments in this category: it offers real accounting and invoicing functionality without requiring a subscription. If that is all you need, Wave is difficult to argue against.
Worklyn's free plan solves a different problem. It gives you somewhere to run the work itself:
- clients
- proposals
- contracts
- projects
- time
- invoices
So the question is not which product is free. It is what you need the free product to do.
If you need basic books and invoices, Wave may be enough. If you need somewhere to actually run a client business, Worklyn covers a different surface.