Both of these illuminators have pink undertones that are very similar to each other when swatched on the hand.
The main differences between these 2 liquid illuminators:
1. Benefit high beam is definitely thicker in texture than MAC strobe cream and gives higher shine and you only need VERY VERY little on this to enhance the cheekbone and t zone area)
2. MAC strobe cream can be used as a brightening make up base before make up (but use sparingly, Otherwise instead of glowy, you will look greasy) and has some hydrating properties that help to moisturise the skin
I do not have MAC strobe liquid, so I cannot compare the strobe cream to the strobe liquid though
How I like to use...
What I like to do for MAC strobe cream is that sometimes i do squeeze out a little from the tube and mix it with my liquid foundations, so that my liquid foundation will give a subtle illuminating effect. Of course, you can use it seperately before the foundation. But I find that this is less effective then adding on to my liquid foundation.
As for Benefit high beam, as it doesn't come in a squeeze tube like MAC strobe cream and also cos it is much more metallic than strobe cream, I don't mix it with my liquid foundation. I only selectively use it on my cheek bone area. I use the applicator to dab a feel dots on my cheek area and then blend it out using my fingers in dabbing motion.
Would suggest / recommend that the liquid illuminators be used after LF and just before powder
One thing to note that if u wanna highlight your cheek bones after powder, then do not use the liquid illuminators, because if not done well, it will make your base make up patchy. For such purpose, I would prefer the MAC cream color base such as pearl over powder make up for highlighting.
Benefit high beam applicator
From left to right: Benefit high beam, MAC strobe cream
If your skin is very oily, I would not recommend liquid illuminators for highlighting. But if u still wan a dewy look, then you can try cream highlighters instead, but as I always like to say, Less is more. So use it moderately.