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If the British, by itself were to either engage the Federals or Confederate forces on American ground (no ship action).. who would win.. disbarring attrition on the Confederate side of course.

British die horribly in either case, they get cut up by massed
union infantry, or outgeneralshipped by Marse Roberts

Depends on the year, British troops are regulars and there's enough of them to overwhelm any Union or Confederate force in the early part of the war. Later on both sides masses of volunteer became largely the equal of regulars in battle and there shear numbers would make it rather impossible for a British force to win.

There's also the matter of logistics. One would be tempted to say that an invasion from the secure base of Canada into Union territory would be much easier than a war from some beachhead in Confederate territory, except that British invasions down the Hudson tended to end terribly.

In the early part of the war, I'd say the British. In the later part, in the days of Grant's Army of the Potomac and Sherman's 60,000 man army shredding Georgia, I'd say that the British would be crushed.

I would ask how big the British army was at that point in time and how many of them are already spoken for. and how much they could actually dedicate to adventures in the United States?

I would be specifically curious how the US and the British compared in hardware?