Welcome to the lake!
We've got a 20' pontoon and use 8lb. Mantus anchors—one on the bow when anchored out in calm coves, one each for bow and stern when at sandbars.
Screw-in anchors "may" work when the conditions are really calm, but most every sandbar on the lake will have wave action either from winds or boat activity, so we just skipped to the chase (after a LOT of trial and error). The last thing you want to have to do while "relaxing" at a sandbar is to manage your vessel. Once the Mantus anchors are set, we're done for the day.
The two other benefits are 1. You never have to get in the water or off your boat, and 2. Those two will work everywhere you go on the lake, in any condition.
If much larger than 20', you could look at 13lb. for the bow, but I'd think the 8lb. should serve for the stern up to 30'.
There are three other anchors people have routinely recommended and had good luck with: Fortress, which is a higher-end Danforth style; Digger, which is a collapsible style; and box anchors.
I have not used any of those since the Mantus solution has worked every single time.
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