Both.
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I would suggest you have your mechanic remove the pistons from the engine every 18-20 thousand kms and have them cleaned and polished.
Too much black soot accumulates on them.
While at it, have him buff the valve faces too, and final polish with brasso.
I know better what should be done or not. Dont need ur suggestions at all. Keeping cars since ages and know very well which mechanic is ustad. I have shared on the basis of my personal experience. U may disagree.
Your money your choice,
Btw, which dealership is this? For the better good of common people.
Did you ponder on cleaning piston tops and valve faces too? They get very dirty. 
Well my car faced performance degradation ( unstable rpms, engine stalling with clutch pressed) after 10k - 20k km too and i got my tb cleaned. Now the issue arised again so i checked the rubber between tb and air filter was broken. I replaced that and cleaned my tb again. Hopefully i wont have to get it done again. Tps sensor broke while getting it opened so that’s another cost i had to bear.
Getting throttle body cleaned and afterwards complaining about increased or unstable rpm is common issue. Hardly mechanics have original gaskets , they simply apply silicon or reuse old gasket causing vaccum leaks. Cleaning polishing butterfly valve won't do much good rather damages it's alignment. Opening tps sensor n putting it back is a science on its own. I have gone thru all this pain n wasted money n then ended up buying a new assembly. I just timely change air filter n sometime drive on hioctane not because of octane ratings but for additives.
sir @Xulfiqar sir i have seen you tube videos about de-carbonizing the engine with water ? is that a process which can help improve upon engine performance & fuel economy.
High octane in local drive is not good. It will create extra soot due to slow burning. Use high octane on high speeds motorway speeds only if you had to.
For TB just go for italian tune up once in a while and you will be fine. The high speed long cruise or adrenaline rush drive in city would leave your TB and Cat spanking clean if done regularly. This is what I am telling you from personal experience after I followed Xulfiqar sb advice and been happy since then Alhumdolellah.
I have not tried water but my car throws water from exhaust on cold start like they say water throwing injun. So one day when the car warmed up, i pressed the throttle hard just to rev it and later on found a lot of carbon/soot thrown from exhaust which the water has moistened due to early idling for 5 to 10 min.
So yes if there is some procedure like that do share because i have already experienced it as shared in the aforementioned para. You know the water engine throws is not that much but i believe if we increase water it can dislodge more carbon. Lets work on it.
Some omcs hioctane claims to clean fuel system which I only opt for when hioctane n regulars price difference is very less like 3/4 rupees per liter which I recover on added extra mileage otherwise previously I only used regular fuel with fuel system cleaners ( p.e.a based) n results were good but as usual they r now hard to find n expensive
Hi octane run is once in a blue moon thing when price difference is negligible. Just to let u knw one of my car exhaust was full of soot and a honest silencer guy told me never ever get your silencers cut open as these r made of alloy n r to last for long. Once open they can't be in same condition. So cleaned it with revving n high speed drive only
That is basically steam cleaning, steam is an extremely potent cleaner and will blast away built up solid soot too, but you have to be extremely careful to not let the engine gulp water as it can hydrolock it and cause a rod to bend.
It used to be pretty normal part of service till the 1960s when engines were quite rough and poorly made. Nowadays you never need it specially for a japanese origin engine (they are very well designed) as long as you are running it with the correct fuel and lube and drive it properly.