Both those options are too risky for a new website and might not bring a good ROI (return on investment).
People these days use Ad Block addons on their browsers so only a few people will see your ads. Some website themes/templates don't even show banners on mobile. Banner ads have a lot of disadvantages these days and I would never recommend them to anyone.
I have a website that gets a lot of traffic but the banner ads clicks are just crap, I'm even thinking of removing them.
If you choose to do SEO, then it will take some time to start seeing some good traffic with $150 unless you rent some good backlinks for about $15 each or even less (which is also risky). If you decide to build a PBN you might get 3 or 4 websites, which might not be enough depending on your niche and competition.
With $150 I would do Facebook Ads or Bing Ads. This way I will spend less and still get lots of dead cheap traffic and most importantly, lower the risk. But if you insist on doing banner ads then do them via Adwords, they're a lot cheaper that way and you'll be paying per click instead of impression.
