What kind of caulk to use around windows (exterior)?

by April

Can someone recommend the best caulking for windows on the outdoor side?

I bought a home last July. It's old but in pretty decent condition. New windows were installed all around the home by the previous owners before I moved in. When it started raining, the windows starting leaking. All of them. I tried two different caulks at Home Depot, it stopped it about 85%, but they all still leak. I had a window guy come by, and he said he couldn't figure out why the leaking was happening cuz the windows are new. I'm planning on stripping all the caulking off and redoing every window. Any advice on what is the best brand?

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