For those that want the entire list - it is below.
1 Belichick
2 Carroll
3 Coughlin
4 Payton
5 Tomlin
6 Reid
7 John Harbaugh
8 Fox
9 Jim Harbaugh
10 McCarthy
11 Pagano
12 Mike Smith
13 Fisher
14 Lovie Smith
15 Kelly
16 Caldwell
17 Ryan
18 Lewis
19 Rivera
20 Arians
21 McCoy
22 Wisenhunt
23 Garrett
24 Marone
25 Trestman
26 Bradley
27 *O'Brien
28 Philbin
29 *Zimmer
30 *Gruden
31 *Pettine
32 Allen
I added my rankings and segregated into 4 quadrants with resoning:
TOP SHELF and SB Winners
1 Belichick - 3 SB wins, 5 appearances, 12 playoffs in 19 seasons, .655 Career winning %, .679 winning % in playoffs, hard to argue
2 Payton - 1 SB win, No argument, personal favorite younger coach; .652 Winning %, 6 Playoffs in 8 years.
3 Carroll - 1 SB win, has done a good job in turning around Seattle in his 4 years, found a QB and won with him immediately
4 Jim Harbaugh - 1 SB appearance, 3 straight NFCE Conf games in 3 years; .760 Winning %; .625 Winning % in Playoffs
5 John Harbaugh - 1SB win, .653 Winning %, playoffs in 5-6 years, no argument
6 McCarthy - 1 SB win, Aggressive coach, seems to adjust well in games. .645 Winning%, 6 Playoffs in 8 years
7 Coughlin - 2 SB wins, .549 Carrer winning %, .632 winning % in playoffs. 9 Playoffs in 18 years
8 Tomlin - 1 SB win - another appearance, Always has Pittsburg in it even with an aging team. .634 Winning %
On the cusp - very good coaches with nice winning %
9 Arians - My way underrated coach. Took Indy 9-3 after Pagano has medical leave in 2012 and Took a Carson Palmer team to 10-6 in the NFC West in 2013 - Wow.
10 Reid - 1 SB appearance, Turned around KC and took Philly to multiple NFCE championships. 10 playoffs in 15 years
11 Pagano - Good coach of a young team. Won division in first full coaching year
12 Kelly - First year wins the division, innovative and translated college success to immediate NFL success. 12 is due to potential
13 Fox - 2 SB appearances, .557 Winning %, 6 playoffs in 12 seasons, took Tim Tebow Team to playoffs and 1 win.
14 Rivera - Improved each of his 3 years in wins, inherited a 2-14 team and went 12-4 last year.
15 Mike Smith - Im assuming 2013 was a fluke. Even with a 4-12 record, career winning % is STILL .625. 4 Playoff appearances in 6 years, other missed season was 9-7
16 Fisher - 1 SB appearnace, .532 winning %, Only 6 playoffs in 19 season. I cant help but think Bud Adams (i.e. V Young, cheap) played a part. Now plays in NFCW
Meh
17 Lovie Smith - .563 Winning %, but only 3 Playoffs in 9 seasons, always seemed to be on the hot seat, enigma
18 Ryan - .519 Winning %, 2 AFCE Championships in first 2 years. Lack of QB plays a role
19 Lewis - 5 playoffs in 11 seasons. 3 straight. I think he has underachieved to a degree, but the Mike Brown factor is real
20 Wisenhunt - 1 SB appearance, didn't have a winning season after K Warner retired.
21 Garrett - .518 Winning % (though 5-3 interim record is only >500 due to a Philly final game give-up). Top 10 QB and no playoffs. Has had imprint on team since 2007
22 Caldwell - .542 Winning %, but in only year without Peyton Manning went 2-14.
23 Philbin - inherited a 6-10 team and improved 1 win in each of first 2 years. Lower due to handling of Martin, Incognito incident
24 Allen - Raiders. Probably the closest guy to Garrett
Too Early to Tell
25 McCoy - 9- 7 in first year with a playoff appearance
26 Trestman - 8-8,
27 Marrone - 6-10; Lost EJ Manuel for 7 games.
28 Bradley - 4-12, but No QB, No WR, etc.
29 *O'Brien
30 *Zimmer
31 *Gruden
32 *Pettine
I put Kelly in the main list since he won the division and really brought HIS offense to the NFL and took Philly from 4th to 1st. I only have Garrett over 3 coaches