Hotstreaks work out miles cheaper man, especially early on.
5 game nights = 100 credits
75 hotstreaks = 600 credits
If running out of time isn't an issue then hot streaks are miles better value for money and they are actually a time saver too (your own time)
For example you buy 5 game nights off the bat and can +7 your way to 70 points (original 5 + 5 game nights) but you had to play 10 games.
5 hotstreaks on the +7 games nets you 70 points in 5 games and cost you 40 credits. That is 60% cheaper than buying game nights and you don't have to play 5 extra games for the same reward so saves on your own time too.
IMO games night should only be used if you think you will run out of time, hotstreaks should ALWAYS be the first choice or you are just burning money. I hotstreaked to Lebron with about 10 hours to spare and all up probably dropped 1500 credits and I was playing +2 on him. You played +5 and dropped 2000