Is there a difference between Sub4Sub and making people sub to your channel to enter a giveaway?

Dave2017

Get The Picture?
Joined
Jan 17, 2017
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I did both and I think there is a difference.. Sub4sub obviously is a waste of time and has no effect at all (besides it looks like got some subs) I did a giveaway when I hit 1500 or 2000 subscribers (I dont remember the exact number) but anyways I gained a lot of subs very fast but they unsubscribed just as soon as the giveaway was over...I done with both!!