The only real question regarding the decision as to whether to use a lab or process your own film is whether you can get what you're looking for. If you can get that from a lab doing the processing for you, why not? If you prefer to get it by doing the processing yourself, have the equipment, time, and skill to do so, why not?
Beyond that question, it's really up to you. Many people prefer the shooting but not the processing and rendering. Others prefer the rendering work. Some like both. It's completely up to you as to which way to go depending on what you want to achieve and how you get it.
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