IMO the most important decision is not so much which model / brand but if you want single stage or 2 stage.
To say brand X two stage is "better" than brand Y single stage is not a good comparison
For me, my Precision Rifles all have two stage triggers , so for me, my bench ARs have two stages ( all Geissele )
My muscle memory has me pull the first stage out until wall of 2nd , do final adjustment then finish pulling through
My issue is I usually go to range with 3 or so lowers, so pretty easy to mess up when you are expecting a 2 stage and you picked up a AR with single stage . This is when I went to all 2 stage to keep things consistent
Had a Giessele Hi speeds in my run and gun AR for years since
When I rapid fire / shooting steel I was just pulling the 2 stage through both cycles, so reality it negates the advantage of the 2 stage .
I ended up getting a Giessele SD3G that has super short reset and is a single stage. I finally saw the light ! Awesome trigger for fun gun
Since then, all my run / fun AR lowers have single stage . IMO I didn't want to have both single and 2 stage for these lowers .
Now I have Timney , CMC and SD3Gs in these lowers
Bottom line is figure out what style trigger you want first , then go shopping for the different brands
To answer your specific question ( I have both the triggers you narrowed down to ) , aside from the obvious single stage vs 2 stage decision , the Timney has a relatively weak hammer spring
This is why the recommend their AR10 trigger for AR15 for surplus / com block ...especially 7.62X39
My Timney ( and CMC ) all have problem with 7.62X39 ( yes I have modified firing pin etc ) . All my Geissele ...even the super light Hi Speed had no problem with 7.62X39
Geissele uses a full power hammer spring, and gets the lighter trigger pull by changing the geometry of trigger surfaces
Geissele Two Stage
Your SSA-E is IMO an outstanding choice for 2 stage . Reason is the wall of the 2nds stage is very noticeable...little over 1 lb more pull . It is easy to very quickly pull 1st stage out , then pull through 2nd stage when ready
The Hi Speed has 3 optional spring rates . The claim to fame with HI speed is both stages fully adjustable
I have one with the NM ...the 2nd stage can be varied from a barely discernible 0.3 lbs !
I have lots of rounds on a Hi Speed NM with 2nd stage at about .6 lbs . I just installed a new Hi Speed and the first time I dry fired it I pulled right past 2ns stage !
Even though I am used to light 2nd stage on my bolt guns and Hi Speed, the new one was scary light..thankfully I was dry firing and it was easy to adjust up to match my other trigger
IMO Unless you want adjustable trigger , stick with the SSA-E