It's all about powerful Domain Expansions, Maximum moves, and secondary picks from lower rarities.
Awesome Ninja Games tried to balance Innate Techniques out as much as possible with Incomplete Domains for Rares and below. That said, some are drastically stronger than others because of complete domains and Maximum moves, which is what you should spin for. Here's the best Jujutsu Infinite technique tier list.
Even among Special Grade Innate Techniques, not all are equal in strength, so I'll be rating all techniques from S-Tier to D-Tier. In S and A-Tiers are techniques you want to roll for with powerful Domains and Maximum moves. B-Tier and C-Tier are techniques for your secondary slots where you want to borrow some good abilities from. Lastly, I'll be rating them with both PVE and PVP in mind.
Ultimately, the best build is a combination of techniques you know how to use, so any technique can be great. Just make sure your main slot is a technique with a named Domain (not Incomplete) and that it has Maximum moves. Check out our full detailed list of all Innate Techniques for more information.