Gimme a Polish or Czech-built T55 with the NATO 105mm and fire control system, stuff an MTU engine in the back hooked to a Renk transmission (or better yet a diesel-electric drive), and add some ERA on the outside. Call it done.
Except most countries can't afford all that fancy NATO compatible stuff.
Even many NATO operators can't afford that fancy NATO compatible stuff (look at the crap operated by Hungary, Czech Repbulic, Slovakia, Croatia, Bulgaria and Romania. Belgium and Netherlands operate no tanks anymore).
Also most operators that buy Chinese prefer the "no strings attached" clause that comes with Chinese/Russian gear as opposed to "you can only use it when we say so" clause that comes with most Western products.
The Chinese also do better support than Russians in terms of post-sale support ala spares – just ask all the Sukhoi/MiG drivers.
And if you don't trust Chinese built, stay away from any thing Boeing!
A lot of equipment sales in recent decades have been virtual give-aways. Often all the buyer has to pay for is overhaul and transport and any upgrades they want.
The Russians gained a massive advantage over Chinese with fall of USSR and extremely cheap ex-Soviet/Warpac equipment becoming available in massive numbers. Even new builds were cheap as Russian industry was glad to take any cash sales they could get as Red Army orders dried up over night.
The Russians also lost any semblance of political ideology, hence were happy to sell to traditional Chinese "non-aligned" customers ala Bangladesh, Myanmar, Sri Lanka, Zimbabwe or even mainly Western customers ala Venezuela or Brazil.
In fact the only time the Russians said no to massive sales was Pakistan (not offend large Indian customer) or Iran (due to Russian interest in Caspian) or sale of strategic systems to China (e.g. Tu-26).
The other "problem" affecting Chinese is blanket ban on sale of Chinese high grade weapon systems. The Chinese still sell "monkey models" such as this Norinco tank.
The Russians on the other hand have been exporting all of their advanced equipment.