I second G1. Similarly I have tried Rakza 7, Rakza 7 soft, Rakza X, EL-S, Barracuda, Tenergy 05 fx, 64 fx, etc. I have gone back to G1 at the end.
Out of them, Tenergy 05 fx and 64 fx are just too fast but I still liked them. I hated hated Barracuda.
If you are concerned, you can start with C-1 first and then graduate into G-1 later. G-1 is just slightly faster than C-1.
G-1 also lasts like forever. Literally you can slap it onto your old blades and play with it for another 2-3 years.
G-1 has been around forever. It is not one of the new tensors. But I love it.
Look, Mark V and Sriver were popular for decades until speed glue ban and 40+ mm balls killed both of them.
Some rubbers are just made well and stand the test of time.
G-1 is one. Some people swear by MX-P (but top sheet loses grip faster). Some people still love their Tenergy and have no desire to "upgrade" to Dignic. Now, Barracuda is also a classic early tensor rubber that many many people like. I just hated the high arc it produced. I felt "no control" whatsoever when I used Barracude. To me, G-1 just feels so direct; it is hard to describe. I mean compared to my forehand rubber, H3 neo boosted, there is no doubt there is the catapult effects on the G-1 side especially when I have both types of rubber on my blade. However, G-1 has this controlled catapult effects that is hard to describe. Where I want the ball to go with G-1, the ball goes there. When I want to push, it is reall easy to generate spins with G-1 and create a nice deep spinny push with lots of backspins. I could not do that with either Tenergy 05 fx or Tenergy 64 fx. It always felt like I had to hold something back with Tenergy, or else I would push the ball off the table, easily.