Which one is more dangerous to human body among high voltage or current and their AC and DC versions?
Which one is more dangerous to human body among high voltage or
current and their AC and DC versions?

Assuming the &quot;1000 V &amp; 1A&quot; and &quot;1 V and &amp; 1000A&quot; refers to the voltage and current that normally occurs in some electrical circuit, the 1000 V (at up to 1 A) is far more dangerous than the 1 V (at up to 1000 A) because the higher voltage can force more current through the human body.
Ohm's Law says resistance = voltage / current, so to push enough current through the body to harm you at 1V the resistance has to be very low - much lower than normal skin resistance. 1V applied directly to the heart might be enough, but that is unlikely to occur by accident.
AC is more dangerous than DC because the peak voltage is higher (which causes higher peak current that breaks down skin resistance more) and it reverses polarity regularly giving the effect of multiple shocks. The heart is particularly sensitive to mains frequency AC because it will try to follow the frequency and go into fibrillation.
Other parts of the body can handle a lot more current, but will be cooked or burned by high current (I still have a hole in my thumb where 240 VAC went through my hand 40 years ago). RF frequency AC doesn't have the same 'shocking' effect, but causes burns that are slow to heal.
Another danger of electric shock is uncontrolled muscle spasms. AC gives continuous shocks that may prevent the victim from letting go, whereas DC only shocks at the moment of contact. Muscle spasms can tear ligaments and tendons, and might cause a dangerous accident such as falling off a ladder or violently hitting something.
However &quot;1 V &amp; 1000 A&quot; DC could still be dangerous if you shorted it out with a metallic object (ring, screwdriver etc.) that vaporized due to the high current flow and splattered molten metal over you. That is why we use insulated tools and wear eye protection even when working on extra low voltage high current circuits.