I guess the question is,...which is best and which is more reliable and easy to use?
Any suggestion's?
Thanks      

There is no best between these two.
Both easy to use.
Inside 100 yards Aimpoint, outside Trijicon.
Both will work and overlap quite a bit, try both.
The trijicon dosn't use batteries.

Apples and Oranges.

The telescopic ACOGs are made for improving shots at distances where iron sights become difficult to use. I figure 150 yards out to 350-400 yards. These sights are used not by snipers but by the designated marksmen for taking out targets at such ranges.

The Aimpoint if made for CQB or Close Quarters Battle where shots are made up close and fast. Figure the range is from 0 out to 150 yards or so - enhansing shot placement in low lighting or on moving targets above what is possible with the iron sights.

Good info! Thanks