Bipod, sled or sand bags?

What is your favorite setup and why? I can see next pros and cons:

1. Bipod apparently more mobile, smaller, so more versatile and convenient.
2. Sled is more stable, precise and probably better to sight in new scope, but bulkier. Plus, airguns have almost no recoil comparing to firearm, so probably overkill.
3. Sand bags are cheaper.

What are your thoughts?
by "sled
' you mean a rest , one piece to two ?
 
Sled? Or not a sled yet... ;)

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