I’ve had both and I’m a big fan of frameless dual pane windows. They are MUCH quieter on the road and far easier to keep sealed against leaks. Plus they look much nicer and work as well on rainy days as dry. It’s true that they are less effective in terms of ventilation but it’s a simple matter to turn on the ceiling vent and in many newer coaches these are nearly noiseless. But it’s like so much else in RVs - everyone has their own individual preferences and that is why there are so many cool choices on the market.
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