Hey Solo,
Cardio work, in my opinion, should be done
after your lifts, because doing cardio beforehand can hinder your workouts. This is because when you are hitting a lot of heavy loads and lifts - you are using energy from your glycogen stores to fuel you - Hence why it is recommended sometimes for a pre/during/post-workout meal with some carbs. This is to fuel your workouts.
Now, after you have completed a really intense lift, all (most?) of your glycogen stores become depleted - so then when you switch over to H.I.I.T. (high intensity intervals) you have no more glycogen stores to be consumed. Guess what starts getting burned next for fuel? If you said fat...you are correct. I am not 100% sure but this is just the way I have trained for the past year and have had
very pleasing results.
So I guess the point I am trying to make is that cardio before your lift will kill your glycogen stores - and you will not be able to optimize your lifts. Doing the opposite of the aforementioned will greatly increase your workout productivity, as you are getting a great pump, building your muscle, and then burning fat at the end of your lift.
This is just my understanding of things, I don't claim to be 100% correct - just the way I have been doing things, and seems to work pretty good for me
I hope this helps bro!