We can compare them regardless of the methods they use, both Emsisoft Behaviour Blocker/Kaspersky Application Control and HitmanPro.Alert are very strong, no matter which one is used you will be well protected. However in terms of actual protection features, both Emsisofts' Behaviour Blocker and HitmanPro.Alert provide some form of ransomware/exploit protection.
I assume HitmanPro.Alert identifies things browser manipulation by doing things such as searching for signs of API hooking on a list of functions which are commonly hooked by malware such as Zeus to steal login credentials (e.g. in Internet Explorer some malware may hook HttpSendRequestA/W) or attempts to identified unknown modules loaded in the browser process (as an example).
Whereas Emsisoft Anti-Malware will not do things like this (again, I "assume" HitmanPro.Alert identifies things like browser manipulations that way, I have not checked nor know if that is a fact or not), it will monitor the untrusted processes and attempt to identify when they are trying to add to startup, inject into external processes (process manipulation), and so on.
However, if I look at it with a different view, I have to agree with you about the comparison, because I think you are both right and wrong about comparing them. Emsisoft Anti-Malware Behaviour Blocker is designed much differently to HitmanPro.Alert to be fair to them, where HitmanPro.Alert aims mostly at exploit mitigation especially (it seems this way at least).
As a summary I am kind of biased between them being compared, since both Emsisoft BB and HitmanPro.Alert have some similarities (e.g. the ransomware protection).
PS: I'm no more of an expert than you are. And this is all just speculation/opinions really