What to know about replacement windows for your home? Dual pane glass vs low e insulating glass? When lowes.com describes "Grilles, Clear Obscure, Clear" has options of either grid or clear? Which is preferred?
Having said that --
They are all double pane (or they should be). Go with low-e, it will pay for itself in just a few years.
Grilles/grid, clear, clear obscure. Go with what you think looks best. They have almost no impact on how the window functions.