Phil... I fish several lakes that have both largemouths and smallies..

The smallmouths tend to favor somewhat deeper, rocky bottoms...The largemouths tend to favor shallower water, weeds and soft bottoms..

In New York's Finger lakes, where I do a lot of fishing, you'll catch smallmouths around rocky points and shoals, and largemouths in the shallow, weedy bays...

Hope this helps..