It is cheaper because the company already owns Bitcoin, so it doesn't need to buy them. What I do is:
- Getting BTC transferred to a wallet at an exchange I trust - Sell the BTC ones I receive them and put the money on my bank account
I switch between using Transferwise and BTC. The downsides are obviously that the price can fluctuate quite heavily. But my experience is that I saved a few hundred Euros each year (around 450 Euros) from using BTC instead of Transferwise.
That's not a lot in the grand scheme of things. What I like about a BTC transaction is that I can monitor it, it is even more transparent then Transferwise and I truly "own" the BTC ones sent.
It is a bit sad that I can't use it as much as I would like so I sell around 90% immediately to pay rent, buy stocks etc, and 10% stay there for future gains.