I have been MDing for decades. Whites and Garrett are the best IMO. I had a Garrett GTAx 550 for years my first one with a target display. That machine was so good. Seated and barber dimes, Indian head pennies, buffalo and V nickles, standing liberty quarters, barber and walking halves, large cents, more modern silver coins. Had the pleasure of searching a defunct local amusement park that started off as a trolley stop like a lot of them in New England around 1890's. Got permission and was sole searcher there for a couple of years as the place was plowed and coins were everywhere. My best spot to date.
My experience has been construction sites are the best option. I have a Garrett AT Pro now.
Best finds, 1906 O Barber Half, 1919 Walking Liberty Half, 1895 S Barber Dime, 1902 Large Cent, 1738 Hibernia Half Penny (found on public property!), a 1901 Indian Head penny in mint condition, 1886 seated dime in high grade condition, 1929 standing liberty quarter in high grade condition..
In E Mass...