All are very good. But there are some differences.
Transformer or autoformer volume controls will be slightly warmer, but not quite as transparent as other passives.
The Tortuga is a very nice unit, I have owned two of them. They can be a little quirky, but have lots of flexibility with the adjustable impedance. The sound is more transparent than a TVC.
The performance of resistor based passives will be very dependent on the quality of the resistor used and the design. I am currently using a Hattor "Big" preamp with the AMRT resistors from AMTrans. I would put this preamp up against all others. But I really like the looks and the ergonomics of Hattor offerings.
If a system is passive friendly, all of the above will sound better than most active preamps. But you have to do your homework to make sure it's a good fit for you.