We have about 80% of our funds in taxable accounts. After maxing out 401k the rest just went into the taxable brokerage account
Where to put the money partially depends on your target date. If its in your 50's or later, aim for the 401k. If its a lot earlier, do it in the taxable accounts after getting the 401k match. We were targeting retirement in our 30's so needed a sizable chunk in the taxable account, which is what we are drawing from now. We'll start to pull out of the 401k in 20 years or so
Depending on what you invest in you may pay no tax anyway, as GrayHare mentioned. As an example, we have some Berkshire Hathaway stock. Unless we sell there is no tax due since there is no income from it
Of course having "too much savings" is a good problem to have