They're the same thing.

<p>A servant is a part of the Heroic Spitit based on Counter Guardian. heroic Spirits are globaally superior if we think about CG like Shirou, but they are also members of the Counter Force like the Beast of gaia. </p><p>Servants/CG < Grand Servants < Heroic Spirits </p><p>A servant gone mad could be stopped by a CG. </p><p>A heroic spirit going mad... could not really, it's all the problem of Fate/Grand Order. A servant going mad could be stopped. </p><p>
</p><p>After, there are "special Counter Guardians", like Primate Murder, that could change the wave. </p>

<p>All i know CG is billion times more powerful than Servents.CG are Mindless.Emiya was servent in Fsn not CG if he was cg holy grail including fyukii city wiped out in a minute.https://www.google.com/amp/s/amp.reddit.com/r/whowouldwin/comments/3wypkf/who_is_the_weakest_character_capable_of_defeating/ https://www.google.com/amp/s/amp.reddit.com/r/fatestaynight/comments/5mwsnp/an_interesting_theory_about_hf_route_and_counter/ </p>

<p>Technically you are mid-right. In term of raw prana, they are more powerful because Gaia and/or Alaya give them prana. But in term of abilities and powers, servants and CG are equals. I would say more, the servant system is all based upon Counter Guardians: </p><p>
</p><p>"<span style="color:rgb(255,255,255);font-size:14.4px;font-weight:normal;">It takes 7 Counter Guardians to control the Primate Murder and the Servants of the Grail War are based on these."</span> </p><p>Also, in Heaven's Feel, Archer make his stuff as Counter Guardian during his fight with Sakura. He was qualified as different, as if Rin did not supply him anymore, and with much more prana in him. And died against her. In the end, the only difference between them is that the Counter Force contains some monsters like Archetype Earth (Arcueid) and Primate Murder, but they are rare. </p><p><span style="color:rgb(255,255,255);font-size:14.4px;font-weight:normal;">Heroic Spirits, however,  and Grand Servants, are different. Grand Servants are servants supplied by Gaia/Alaya, and without the grail's restrictions. So they can use 100% of their classes. Heroic Spirit are stated themselves as the most powerfuls existence that even magicians couldn't make a contract with (even so they can do it with gods). Both doesn't have to bother about prana anymore, and their raw powers are more than enough to wipe out the world.</span> </p>

Read the whole thing.It was Counter force in HF not counter guardian if it was he would clean the entire event on a minute.

CG also can wipe out all humans.