Here is a comparison between eXtreme Gammon (1.00), Snowie (4.7.1), GnuBG (20091016) and BGBlitz (2.6).

Note: 1-ply, 3-ply etc... refers to eXtreme Gammon, Snowie and BGBlitz terminology. The GnuBG equivalent is 0-ply, 2-ply etc...

  eXtreme Gammon
$49.95		 Snowie
$365.00		 GnuBG
Free		 BGBlitz
$46.00
Strength
   - Estimated Elo (3-ply) 2240 2231 (-9) 2234 (-6) 2218(-22)
   - Est. Elo (Strongest1) 2260 2231 (-29) 2234 (-26) 2218(-42)
   - Multiple processor yes no yes yes
   - Multiple processor N-ply yes NA no NA
   - Simple mode yes no no no
Analyze
   - Background Analyze yes no no no
   - Checker play according
     to Score in Rollouts		 yes no yes yes
   - Multi pass yes Notsure
(only choice of Rollout)		 no no
   - 4-ply, 5-ply yes no yes no
   - 6-ply, 7-ply yes no no no
   - XG Roller (Mini Rollout) yes Notsure
(Not for play or 1st pass analysis)		 no no
   - Batch Analyze yes yes Notsure
(Using command line)		 no
Game play
   - Background Analyze yes no no no
   - Tutor Mode yes no yes yes
   - Competition Mode yes no no no
   - Self play yes no Notsure
(not fully automated)		 yes
Speed2
   - Import a match 0.8 sec 27 sec
(34 times slower)		 1.0 sec
(1.3 times slower)		 0.2 sec
(4 times faster)
   - Analyze in 1-ply 0.7 sec 36 sec
(30 times slower)		 4 sec
(5.7 times slower)		 NA
   - Analyze in 3-ply 19.0 sec 13 min 59 sec
(44.2times slower)		 38.0 sec
(2.0 times slower)		 NA
   - Rollout 3-ply Game 9
     Drop (108 games)		 28.2 sec 9 min 22 sec
(19.9 times slower)		 1 min 49 sec
(3.9 times slower)		 18 min 24 sec
(39.1 times slower)
   - Rollout 3-ply Game 16
     Double (108 games)		 24.8 sec 8 min 40 sec
(21.1 times slower)		 1 min 12 sec
(2.9 times slower)		 10 min 50 sec
(26.2 times slower)
   - Total 1 min 13 sec 33 min 04 sec
(27.0 times slower)		 3 min 44 sec
(3.1 times slower)		 NA
Import
   - GammonSite yes yes yes yes
   - Games Grid yes yes yes yes
   - TrueMoney Games yes yes yes no
   - PartyGammon yes no yes no
   - BGRoom yes no yes yes
   - NetGammon yes yes yes yes
   - Position from ascii board yes no no no
   - Real Money Support yes no no no
Save game size
   - Save Game Size 399 KiB 899 KiB 1583 KiB NA
   - Export HTML size 4880 KiB 2824 KiB 6911 KiB NA
   - HTML image folder size 386 KiB 856 KiB 2029 KiB NA

1 Strongest level (in a reasonable time):
   - eXtreme Gammon: XG Roller+
   - GnuBG: 3-ply (Grandmaster  is weaker than 3-ply: see here)
   - Snowie:  3-ply.
   - BGBlitz: 3-ply

2 Speed test was determined using the following match: eXtremeGammon1-eXtremeGammon2 25 points match.mat and on a computer with a Intel Core i7 at 2.66 GHz. (GnuBG was run using 8 threads)

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