I'm going for adv threads. With an income of 500 daily, you should be able to get 4/5 threads every week (18/month). With the others from strong nin ja packs, you should be able to get like 3/4 points each season.

I usually go for advanced threads as theyre pretty hard to come by. But my BA is rank 6 and I'm trying to get it to 7. The tactics aren't bad either though as you do get a fixed drop of each page. Really depends what youre needing. If youre really hurting for the tactics then go for those. Try to get them to at lest level 4 or 5. Though stacking advanced threads will give you a leg up in the long run once you(if you dont already have rank 6 armor) to pu* to level 7. ALso dont forget purifies. Most people sweep them to the side. Although you can get them from almost anywhere now. It takes a ton to get good stats. This post was last edited by veelocity at 2017-6-23 19:29

I have been spending mine on the tactics pack in order to level them up, though as previously mentioned, the advanced threads are also a good investment option.

Tactic pack is the best option for me

tactics gives a better coupon value per credit. However, it is diversified which makes some of the value became sunk cost and useless. That said, as you will also get random pages elsewhere, statically speaking the sunken stuff can still be useful if you end up getting some of those pages multiple times and get lucky on upgrade.

Advanced thread is safe, but it really cost a lot to get anywhere.

Personally, I would suggest you get tactic pack until you have at least one lv 5 tactic. At which point, most of the pages you get will most likely be never useful. Then get advanced threads.