PAF will operate both. Numerically PAF has to be close to India.
the PAF will significantly thin down its manned fleet as time goes on. It is simply impossible to keep the fleet at large numbers while inducting more advanced aircraft.
Naturally the PAF is going for a mixed fleet of 4.5 and 5th gens. Clearly they've committed to J-10s and supporting the JF-17 platform for the longer term.
That leaves F-16s and Mirages.
I still dont believe the J-35 actually meets the wants of the PAF. The reality is, the deep strike aircraft the PAF envisioned when they released AZM ASR was NOT the J-35 at all, rather, it seems to be more akin to what the TFX is coming out to be. Larger weapons bay, likely greater combat radius and also, realistically, probably better OEM support.
I am more than happy to be proven wrong, but, i suspect the J-35 is being used as more of a pressure tactic than anything else.
The PAF had done this previously, when we were looking to secure a favourable deal on the Mirage 2000, the PAF started to evaluate the SU27 and then provided indication that it would make a buy, all in the effort to get France to provide a favourable deal.
It does not make any sense, the PAF announcing a deal (j35) which would have far greater strategic implications and could trigger a serious arms race, but then did not announce J-10 procurement, nor the procurement of a handful of drones, or even SAMs, none of which would have any effect on the current environment. It all seems too fishy.
The PAF also had horrible experiences with CATIC, particularly when it came to support for the JF-17 project, from unreliable/expensive spare parts to downright exploitation when it came to the purchase of spares. CATIC would scrub part numbers so the PAF could not go out and procure harnesses and cabling themselves for example.
PFX in itself is a means of reducing reliance on the Chinese, by taking over the production line (which China isn't intending on continuing to support anyway) bringing control home, alongside giving us more autonomy on the production of components and also parts. This is a good thing, where we will have finally actually indigenised the JF-17, being able to ACTUALLY do what we want with it. Not having Chinese lock us out of certain areas for example.
This is the kind of control the US exerts on its partners, the Chinese have been no different, just less vocal but motivated more by money and greed than politics unlike the yanks.
If the PAF was to actually procure the J-35, it would likely be as a result of poor, short-sighted decision making, alongside Sidhu's pockets being lined. I don't think its the right choice and i suspect the PAF doesn't either.
The PAF knows it missed the mark with the TFX and will be too late to get in at any point. Turkey knows it needs us to actually ensure they can drive the cost down to the point where they can actually procure it and support it in any reasonable numbers. The Saudi's expressing interest is also a good sign, potentially hinting at some Pakistani involvement (pilots, ground crew etc).
If the PAF was to procure both, its clear the TFX would be a longer term investment, coming to fruition later, via replacement of the F-16s while the Mirages are subbed out via the J-35 (even though this doesn't make sense). But at the end of the day, its very clear, that what the TFX is DUE TO BE, is an aircraft better suited for the PAF. The force's scepticism is warranted, just because the aircraft has flown, does not mean it will 100% make it out, the SU57 is a great example of this. Though, i am more certain than not, that the TFX will enter service, however, we never know...
Realistically, we will likely procure 3/4 squadrons of FGFA's, which is ALOT, with the rest made up of 4.5 and UCAVs