Hello,

Small history: 2 years ago i pickup up the Rc hobby again and last year i joined competition again at local rc club. I got myself a Tamiya TB-02B, some brushless kit, servo and FlySky GT3B on Aliexpress. A little later that year i bought myself the Serpent Srx2 Gen3 second hand. I noticed after practicing, the FlySky GT3b didn't do it for me. So i upgraded to the FlySky FS-GT5. My driving got a little better, but after my first race, i noticed i had no control over what my car did.
Some guy at the local club helped me out alot. One day i asked him to use my transmitter (flysky) and my car, just i know i was really bad at it or the gear wasn't right. From the first few seconds he noticed the FlySky FS-GT5 was horribly slow. Having a small budget i bought myself the Futaba 3PV with the R304sb reciever. This was a huge upgrade compared to the flysky. It finally was possible to keep myself on track for many laps and actually finishing not last :P

Now the question: i want to upgrade again this year: i was thinking about the Futaba 4PM or a Sanwa MT-R or maybe MT-5 (performance wise the sanwa seem the same). I currently have ZTW Beast Pro esc, and the Power-HD R12s servo. Will i profit from the whole super response thing if i don't have gear that supports it?
I googled for answers, found alot of opinions, but also some latency tests. I have no plans in buying a 500€ transmitter. Just wanna make sure it's worth spending some money on a transmitter while it's maybe some other things need an upgrade?

I run Airtronncs M11 and X. I hate Futaba as if you want telemetry it cost big bucks. Other factor is I wanted a left hand radio and Futaba is expensive to get it. I plan on getting a Noble pro 4 which has 18 channel option. I could care less about the response. They are all about the same response. I can't stad paying big bucks for a radio that will be out of date by the end of the year.

Based off that description, you're probably not going to be skilled enough to notice a speed difference between the 3PV and the other radios you mentioned, there's not much in it. The main benefit you'll get from a new radio is better ergonomics.

You've already gone through several radios in a short amount of time. I'd suggest you hold off, save the money and go for a high end radio in a couple years. Incrementally buying small upgrades will cost you more in the long run.

The mentioned servo does not support SR/SSR/SXR/UR so the 4PM you mentioned you can not use its high speed SR mode. In that case all transmitters you mentioned will act similar. Futaba in T-FHSS will have a framerate of 333Hz and Sanwa in SHR (i believe) has a framerate of about 380 Hz which is a maximum limit for normal digital servo's. In that case the mentioned 3PM with the same T-FHSS mode will work the same.

The main differences will be with the ergonomics and the menu structure.

Personally, I wouldn't worry about upgrading unless I was running in the modified class. I've used $50 Flysky Radios and $700 Sanwa and Futaba radios. I didn't notice much of a difference while running in stock class. Modified on road, I can see why you might want the quicker response time. Also, when you get into higher dollar radios, you get into higher dollar receivers. If you have multiple cars, you might want to take that into consideration. As for which brand to get? Flip a coin. There's a reason why they are both used by the pros. If one was truly better than the other, then the pros would only use that best one.

Due to the fact googling for answers gave to many different opinions... I got myself the Sanwa Mt-r.
First experience: the difference is huge. I wanted to stay with the futaba, getting a 4pm or something.
But since you see for about 95% sanwa, i got my myself a sanwa.
This thing basically makes the car do what you want it to do, at the moment you want it to.
So i am happy now

That is the problem of Futaba.
Sanwa is giving away many transmitters to topracers that their followers want to buy Sanwa as well. Futabe does not give away that much so no followers that wants to buy one.
Now Flysky with the Noble transmitter is doing the same as Sanwa, I do see more topracers who where given a Noble.

I have an MT-5 and it's been great radio for me.

agreed hold off on the upgrade, Ive driven side by side a 3pv(friends buggy) and 4pm(my buggy) and wasnt able to notice any response difference between the radios, aside from the much nicer programming interface with the 4pm the 3pv imho is just as fast

Too late, OP already said they've upgraded to a mid tier Sanwa.