If this can help you make a decision, two of the biggest farms in the West Grove area are moving out to Maryland. The first farm will leave starting this September and the second the following September. We have excellent schools here in the Avon Grove School district w/ all kinds of actvities for the kids. In some of the older developments 10-20 years old, we have pretty low taxes- mine are only about $4200 a year for half an acre and a 4 bd 2.5 bath home-we even have public water and sewer and no HOA fee which is a common thing with some of the newer developments in this area.
I deffinately would recommend West Grove to anyone who would ask-Hope this helps.
Hills of Sullivan is a lovely community. The smell is not from mushroom houses, it is from the mushroom composting operations on Penn Green Rd. which do run year round. Hills of Sullivan is not down wind on a normal prevailing wind day , however, when the wind shifts from it's normal direction or a storm is coming or on those misty moisty days you will get the smell. If you do not want the smell at all, I would suggest looking at communities around the Route 896 Corridor, only a few miles away but without the smell.....
If you are much older or have no kids, its a good investment to move to DE.
If you want some rolling hills and farm space, move to PA. When you cross the border from DE to PA, the landscape literally changes in an instant.
Hills of Sullivan and LondonCroft may be good areas to settle, since they are on elevated land tables.
i'm in franklin township, where the income tax is 0.5%. my property taxes are a "low" ~$6100 (recently appealed down from ~$8900). avon grove schools are supposed to be very good, but i don't have school-age kids yet. many i know either live in PA and use public schools or live in DE and use private schools. i have heard many low opinions of DE public schools, but have recently heard a couple more positive. there are definitely some lesser districts in DE, but a couple stand out in a good way. DE state income taxes are higher, property taxes lower. most in landenberg/avondale area shop in DE anyhow, so still benefit from no sales tax.
imho, these things all balance themselves out. otherwise, everyone would live in one place. but your preferences and priorities will make the difference. if mushrooms are your concern, visit one of the farms and see about a tour. of course, it's hard to find better mushroom soup anywhere! :-)