Should I opt for an electric or cordless oscillating tool?
Whether you choose an electric or cordless oscillating tool depends on how you plan to use it. If you need to work continuously and often on heavy duty, long-term projects, go with an electric oscillating tool, since it has a constant power source and will be able to power you through numerous tasks. If you prefer something more portable, a cordless is fine. Just be prepared to charge it periodically and know that its capabilities may be limited (run-time, etc.) with its limited power source.