IBKR is a full service online brokerage. They exist in more countries than just Canada, and service a customer base that absolutely dwarfs Wealthsimple when it comes to both net worth, and variety.
Wealthsimple is supposed to be Canada’s Robinhood. It’s designed to be relatively idiotproof, but it has a lot of limitations. The catch is that it makes Robinhood look like a real online brokerage, because it’s kept so low end.
That said, based upon what you said, I doubt you’d use everything IBKR offers, and it’s the fees that you’d have to do the math on where it makes more sense for you - and deciding if those handful of ETFs are enough reason for you to switch.
IMO IBKR is much more usable if you trade a fair amount, but for buying and holding, you may as well be with Questrade or Wealthsimple.
You can also link your IBKR account directly with other subscription platforms like TradingView. It opens up endless possibilities for losing money, it's glorious. Their fee structure for options is about as good as we can get in Canada. And like others have pointed out in prior IBKR discussions / topics, you get direct access to foreign exchanges so you can purchase direct listings vs. ADRs.
In a nutshell, if you're into simplicity / vanilla products go with WS; if you're into complexity / derivatives use IBKR.
