There are cheaper ways at times for certain amounts being sent despite all the claims, but as you say, Wise is easy and fast which is an advantage. Wise even have a comparison tool on their site which shows when they're not the cheapest.
Just now for £500 GBP it's Moneygram and for $1000 and $5,000 USD it's XE. Euro similar to USD but for even higher values. Moneygram are allegedly slow but I haven't heard much about XE.