I cannot cope with 'clutter'. I am not talking about stuff around the house but stuff all around my vision and cluttering my head. I have sometimes walked out of shops, and even, once, a museum, because I was suffering from visual overload and beginning a panic attack. As a result I have devised some strategies to cope with the too much choice quandary
1) Decide what exactly what you are looking for and then eliminate anything that does not meet your exact specification.
2) I find doing the preliminary search on ebay helps, not necessarily because I intend to buy from ebay but because they provide neat listings of products that make it easy to work out exactly what you are looking for.
3) Make a decision to buy the product from a shop you have always found reasonable in the past. Then choose from their range of goods only
When it comes to supermarket shopping. I do not have a problem. I always shop with a list and, where I buy brands, Marmite, for example, I just head straight for where that is and I do not consider alternatives. The same with yoghourt, DH likes Activia (personally, I loathe yoghourt), so it doesn't matter how many brands or flavours they have, they are invisible to me. I just, again, go straight for the product I want.
Otherwise I just head for the own brand, or the cheapest, if that isn't the own brand.
My aim is always to limit the range of goods I have to choose from.