If you expect to become employed by a Swiss employer soon (within a year or so), then you should avoid investment solutions, in my opinion. When you become employed again, you will have to transfer your vested benefits out of the investment solution and into your new occupational pension fund. The chance of your being forced to exit your positions during a dip and making a sizeable loss is very high.
A vested benefits account makes a lot more sense for in-betweeners. You can find the current highest-yield account and information about possible fees using this comparison:
If you expect to become employed again soon, then the effort of opening a higher-yield account and having your benefits transferred may not be worth your time.
If you expect to hold your vested benefits for a long time (i.e. you are moving to an EU or EFTA country and your benefits will sit here until you retire), an investment solution like Viac or Valuepension will likely deliver higher returns than an account.