Is a short period of intense exercise better than long/easy

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Hey everyone :)

I alternate exercising at about 9 P.M. most days, if I don't "exercise" I at least go ride my horse, so I pretty much get some exercise every day. The 2 main exercises that I do: 40-50 minutes of kickboxing that leave me feeling slightly sore the next day, but not completely exhausted afterward (there's a lot of gap time in this, so your heart rate slows and speeds up during the workout), and 15 minutes of intense nonstop cardio that leave me exhausted and sore depending on which muscle I'm focusing on (l do stuff like jumping squats and dead rows, push ups, and burpees, stuff like that).

So, my question, is one of these preferable, and could I do the intense 15 minutes every day without adverse effects?

Thanks! :)

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