While DeWalt tools are generally seen as more reliable, they're also more expensive. Kobalt is a great pick for DIYers, but DeWalt is better for professionals.
DeWalt Vs Kobalt: Which Power Tools Are Worth Buying? Here's What The Reviews Say

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While DeWalt tools are generally seen as more reliable, they're also more expensive. Kobalt is a great pick for DIYers, but DeWalt is better for professionals.