this is a hard question to answer, because it's very situational.
First of all, we would need to have all of the links you're considering getting, side by side, so we can compare them, which I'm sure you don't want to reveal (nor should you) for privacy reasons.
And secondly, managing 10 PBNs on your own is a lot of stress and work for most people, and if you know that you don't have the time or patience to put up with this I recommend you simply buy the niche insertions. And don't forget that your own PBN won't help too much (especially if you're in a tough niche) in the beginning because you need to grow the authority of those PBNs before they can offer valuable links, and this takes both time and money.
So, no matter how you look at it, editorial links seem like the best choice on blind guessing. At least from a faster results point of view...
on the contrary, your own PBNs are the safest best because you own those links. Editorial links are purchased, and if - for some reason - the seller decides to take your links down, nofollow / noindex them, dilute their power by adding more OBLs on the page, or if google devalues / deranks the pages where your links come from.... well, bye-bye $6000
But with your own network of sites that you have 100% control over you are literally on the safe side (unless google still tanks your sites, of course, but if you're careful and prepare for inevitable losses the losses will be minimal, which is still safer than buying links from someone who might, or might not be in business tomorrow for whichever reason...)
I'd say go for editorial links. $6000 is a lot of money and since you're considering paying this money for links I assume that you've done your research and you've found good backlinks, so go for these links!
