JohnfromUK and others on this BBS have said they use fibre wads. Is that because the UK requires them to avoid litter on the shooting grounds (since they decay), or is there some safety or superior function motivation? I assume 90%+ of the shells available in the US have plastic wads/shot cups.
The reason for me is that most game shoots I go on request (often require) felt wads for biodegradability and animal compatibility (there are reported cases of animals eating plastic wads with ill effects). The clays ground I shoot at regularly requests felt wads. They pattern slightly more open I believe, but are otherwise fine for me.
When I ran a game shoot over several different owner's land - one landowner was very firmly 'felt/fibre wads only', so much so that if he found plastics wads he threatened no more shooting - period. Hence I had to be very strict that people shooting and their invited guests only ever used felt/fibre wad cartridges.