Anything you add to your soil should not smell offensive and if it does it should not be added to your soil. If that mushroom compost has an off odor do not buy and use it. If the leaf mold smells something like silage (which smells that way because of anaerobic digestion) it has not been handled very well and is not something you would want in your garden. The problems they might cause would be more immediate than long term, but still problems you do not want.

we use mushroom compost (fresh from the farm) to start our gardens with and to top up when needed, but we also feed the medium by adding all rottable scraps under the mulches we use. the mulches are green type spoilt hay mulches so there is nutrient being added all the time.

no matter what migh be in mushroom compost it is all we can access as those mixed soils from the suppliers could contain all sorts of undesirables as well, but in the end you have to use what is economically available. we don't till/dig gardens the worms do that free of charge and effort.

len

Here is a link that might be useful: len's garden page