China V US/Brits
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Depends on where the battle takes place...
If it's over Taiwan, the Chinese LOOSE, since all the manpower in the world is useless if it's resting at the bottom of the Formosa Straits... They have a huge army, but a PATHETIC navy....
If it's 'Inchon again' -- i.e. a land battle in a bordering country -- then it's a toss-up favoring China. They can actually use their numbers here, which is their major advantage...
In a 'proxy war' scenario, ala Vietnam or Iraq, the Chinese loose again, due to logistics issues. Once again, the Chinese have a human wave army (they have people to spare). This is a very formidible defensive arrengement, but it's USELESS for force projection, since keeping such a force supplied with men and equipment is EXTREMELY DIFFICULT when outside of truck/railroad range, and ESSENTIALLY IMPOSSIBLE accross oceans (especially when your enemy has a top-notch submarine fleet, as both the US and UK do). When you're dealing with a large/long overseas war, THE SUPPLY LINES WIN & LOOSE BATTLES BEFORE THE GRUNTS GET A CHANCE TO FIRE A SHOT...
TIGER vs LION
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Tiger.... Bigger, meaner, and much stealthier.... Esp if dealing with males...
Tigers are solitary: both sexes hunt and fight...
Lions are pack animals. Males don't hunt, and although they are quite powerful fighters, the edge goes to the tiger here...