Always a combination of both. Because you can't invest without saving first. Unless you're investing some form of debt, which mean's you aren't investing at all, you're simply attempting to discharge debt.
Additionally, saving for savings sake is just like shooting yourself in both feet because there is a thing called inflation that is literally eating away at your money 24 hours, 7 days a week, 365 days a year - and this cannot be stopped. Therefore savers aren't actually "savers," they're losers. It's only when savings are put to work via investment that things start to click.
So overall, a combination of both saving and investing is the best and, most nutritional, recipe in the financial cookbook
