asking what is the best transmission is kinda like asking what the best color is... it's really an opinion thing, along with what will work with what you've already got in your truck...
if you try the search feature at the top of the page, i'm sure you will find your answer
The FM145 is a marginal trans IMO, it uses ball bearings (M5OD has tapered roller bearings), and doesn't have the greatest 5th gear lubrication.
I had a FM146 in mine and right about 10K miles after I took ownership of it it developed a noisy output shaft bearing (audible in 5th gear). I have a used M5OD (from a '90 Ranger) in it's place now and been fine since.
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