In general, Vulcans have a very high track record and are probably substantially stronger than humans...Cap to 1 ton level IMO. Klingons are supposed to be stronger than humans, but likely aren't a lot, say 25% stronger given equal size and build...probably similar to Vampires in the Buffyverse...Worf was a very big Klingon, and likely around peak human strength because of it, or even above. Most Vulcans are still stronger, despite a couple of instances where Vulcans don't look as impressive (in TNG the guy who played Tuvok played a Vulcan that got beaten by a human, and Belanna beat a vulcan 1 on 1, but she's mostly human and partly klingon....conversely, evil Spock was owning the Enterprise crewmembers with only Kirk having any effect, and he still beat them, and Vulcans were really scary at times...in an episode of TNG, they were supposed to be several times as strong as humans...so probably in general around 1 ton range.
All the above are tough, but Buffy just outclasses them.
The first real challenge IMO...Kirk beat Khan in TOS, and held his own against Spock...he might talk her into not fighting actually and end up kissing her, but she still wins...Kirk though makes most peak humans and lower end metahumans work for it, because he never gives up, will use the environment, and finds a way to beat even the most unwinnable scenarios...but yeah, she wins
R5. Tuvok: Vulcans are hard to peg...unnamed Vulcans can be beaten by humans, but at times, seem WAY above human...and well into superhuman...so he's probably above most of the Vampires she's fought, and she's still recovering from Kirk, so Buffy MIGHT lose here...
If Buffy were fresh, she'd beat him handily. Max would be close, as Worf is a better fighter, and I think Buffy is substantially better than Max overall, but fresh Max would win. After fighting a Vulcan and Kirk, if Buffy makes it here, she probably loses. Max goes forward
R8. 7 of 9
Max loses badly.
Buffy would have a shot fresh, but Data's brain coupled with his strength and durability makes him really tough to take out.