risom webbed lounge chair - arms or no arms  

Aesthetically
I like without arms.

Both
I own one sans arms, and i feel that it is a good sit, and a much more distinctive look. The armed version also sits/looks good, but looks slightly more generic "Danish" furniture. The arms also presage Risom's later style, where he suspends the seating elements within the frame.

Regarding both comfort and...
Regarding both comfort and aesthetics, I too prefer without arms. The right kind of straps and color can make a difference.

Armless!
The armless version is all about the beautiful curves & webbing.
The angular arms and accompanying heavier legs of the other version detract.
Is it an optical illusion, or is it a wholly different seat on the two-- armed lounge chair is more pitched & curvier than side chair (?).

Illusion
Risom used the same seat shape (say that 3x fast) in a number of his chairs, including the webbed and upholstered versions.

Arms or no arms
Either way, they are beautiful chairs. I have one with arms but have sat in the armless one. I think form should always follow function and I am a lazy sitter so I like having arms. I can relax more. Still, the armless model is awfully cool.

I like the armed version...
I like the armed version better as well. Less flashy and more useful...