To Hit Mechanics

Here's your random shane thoughts for the day!  I'm running on a bit less sleep due to the time change and not going to be earlier enough.

I've got some thoughts on To Hit Mechanics in old school D&D type games.  Having recently played TBH, which has an interesting way to do "to hit mechanics", I've started thinking about mechanics overall and how they are all very similar (despite people yelling and screaming that one is better than the other).

Ascending AC to hit  is basically roll a d20 and add whatever STR/DEX mod to it (and/or attack bonus).  Example, to hit an unarmored orc I need to roll a 10, I roll a 6 + 3 and get 9.  Which I count on my fingers everytime!

Descending ac, the orc has an AC of 9.  I check my THACO (at first level), and find out that in order to hit the Orc I need 10.  (thaco - armour class).  Which for some friggin reason is way easier in my head.

for the black hack, it's roll under your appropriate stat.  If you are using a sword it's roll under strength, if you are using a bow and arrow its roll under dex.  However if the monster  has more than one hit dice, you have to add that to the roll.  So as an example If I'm trying to hit a 4HD orge and I have a dex of 15, I need to roll under the 15 but with +4.   Let's say I roll a 10 and then with the +4 I am at 14, which is under my dex.  Once again I'm counting on my fingers.

Honestly I think it really depends on how someones brain works.  For me descending somehow makes the most sense, because I have a target and I have to hit that.  Here's the number, roll the dice and if I'm over excellent!

VS both of the above I roll and then add to see if I have accomplished the task.  So somehow it's an extra step kinda....