All city: New York 1949.

1949 all New York City selections are in bold.  Lefty pitchers are in Italics.  Pyth is Pythagorean W-L (estimate of a team's winning percentage given their runs scored and runs allowed).  Comments below.  Click link to view data for years 1947-1957.  Seeing the players in a matrix may have some surprises.  Batting data below sorted by OPS+ per team.

1949	New York Giants	Brooklyn Dodgers	New York Yankees
C	Wes Westrum	Roy Campanella	Yogi Berra
1B	Johnny Mize	Gil Hodges	Tommy Henrich
2B	Hank Thompson	Jackie Robinson	Jerry Coleman
SS	Buddy Kerr	Pee Wee Reese	Phil Rizzuto
3B	Sid Gordon	Billy Cox	Bobby Brown
LF	Whitey Lockman	Gene Hermanski	Gene Woodling
CF	Bobby Thomson	Duke Snider	Cliff Mapes
RF	Willard Marshall	Carl Furillo	Hank Bauer
P	Dave Koslo	Preacher Roe	Vic Raschi
P	Monty Kennedy	Don Newcombe	Eddie Lopat
P	Sheldon Jones	Joe Hatten	Tommy Byrne
P	Larry Jansen	Ralph Branca	Allie Reynolds
Man.	Leo Durocher	Burt Shotton	Casey Stengel
W-L	73-81	97-57	97-57
Pyth	81-73	97-57	95-59
Dif	-8	0	2
Rank	5	1	1
WS		lost	won
Attend.	1,218,446	1,633,747	2,283,676
Att rank	4	1	1
1949	New York Giants	Brooklyn Dodgers	New York Yankees

Rk	Pos		Age	G	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	OPS+ ▾	TB	GDP	HBP	SH	SF	IBB
1	3B	Sid Gordon	31	141	588	489	87	139	26	2	26	90	1		95	37	.284	.404	.505	.909	142	247	24	3	1
2	OF	Bobby Thomson	25	156	689	641	99	198	35	9	27	109	10		44	45	.309	.355	.518	.873	131	332	15	2	2
3	OF	Willard Marshall*	28	141	581	499	81	153	19	3	12	70	4		78	20	.307	.401	.429	.830	123	214	10	1	3
4	2B	Hank Thompson*	23	75	320	275	51	77	10	4	9	34	5		42	30	.280	.377	.444	.821	119	122	1	1	2
5	OF	Whitey Lockman*	22	151	685	617	97	186	32	7	11	65	12		62	31	.301	.368	.429	.798	113	265	8	3	3
6	1B	Johnny Mize*	36	106	442	388	59	102	15	0	18	62	1		50	19	.263	.351	.441	.792	111	171	5	3	1
7	MI	Bill Rigney	31	122	441	389	53	108	19	6	6	47	3		47	38	.278	.356	.404	.759	103	157	10	0	5

Rk	Pos		Age	G	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	OPS+ ▾	TB	GDP	HBP	SH	SF	IBB
1	2B	Jackie Robinson	30	156	704	593	122	203	38	12	16	124	37		86	27	.342	.432	.528	.960	152	313	22	8	17
2	C	Roy Campanella	27	130	507	436	65	125	22	2	22	82	3		67	36	.287	.385	.498	.883	131	217	11	3	1
3	OF	Carl Furillo	27	142	596	549	95	177	27	10	18	106	4		37	29	.322	.368	.506	.875	128	278	16	3	7
4	OF	Duke Snider*	22	146	615	552	100	161	28	7	23	92	12		56	92	.292	.361	.493	.854	123	272	8	4	3
5	1B	Gil Hodges	25	156	675	596	94	170	23	4	23	115	10		66	64	.285	.360	.453	.813	113	270	13	4	10
6	SS	Pee Wee Reese	30	155	742	617	132	172	27	3	16	73	26		116	59	.279	.396	.410	.806	113	253	5	4	6
7	3B	Billy Cox	29	100	426	390	48	91	18	2	8	40	5		30	18	.233	.290	.351	.641	68	137	9	1	5

Rk	Pos		Age	G	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	OPS+ ▾	TB	GDP	HBP	SH	SF	IBB
1	OF	Joe DiMaggio	34	76	329	272	58	94	14	6	14	67	0	1	55	18	.346	.459	.596	1.055	178	162	11	2	0
2	1B	Tommy Henrich*	36	115	502	411	90	118	20	3	24	85	2	2	86	34	.287	.416	.526	.942	148	216	7	5	0
3	C	Yogi Berra*	24	116	443	415	59	115	20	2	20	91	2	1	22	25	.277	.323	.480	.802	111	199	6	6	0
4	OF	Gene Woodling*	26	112	357	296	60	80	13	7	5	44	2	2	52	21	.270	.381	.412	.793	110	122	6	1	7
5	OF	Hank Bauer	26	103	344	301	56	82	6	6	10	45	2	2	37	42	.272	.354	.432	.786	107	130	9	1	5
6	3B	Bobby Brown*	24	104	384	343	61	97	14	4	6	61	4	3	38	18	.283	.359	.399	.759	101	137	9	3	0
7	OF	Cliff Mapes*	27	111	369	304	56	75	13	3	7	38	6	0	58	50	.247	.369	.378	.747	98	115	4	1	6
8	2B	Jerry Coleman	24	128	523	447	54	123	21	5	2	42	8	6	63	44	.275	.367	.358	.725	92	160	12	2	11
9	CI	Billy Johnson	30	113	383	329	48	82	11	3	8	56	1	0	48	44	.249	.348	.374	.722	91	123	15	2	4
10	SS	Phil Rizzuto	31	153	712	614	110	169	22	7	5	65	18	6	72	34	.275	.352	.358	.711	88	220	18	1	25

Jackie Robinson 1954 via Wikimedia Commons

Jackie Robinson was NL MVP.  Despite being last among Yankee regulars in OPS+ with 88, Phil Rizzuto was second to Ted Williams in AL MVP voting; Pee Wee Reese was 1949 all city SS.

In their first head to head comparison Roy Campanella beat Yogi Berra.  Duke Snider joined 1948 newcomer Gil Hodges in the Dodger starting lineup.  Dodgers Carl Furillo and Don Newcombe made all city for the first time.

New manager Casey Stengel led the Yankees to a 4-1 World Series win over the Dodgers despite Joe DiMaggio playing only 76 regular season games.  The Giants in Leo Durocher's first full season as their manager under performed.

In the 1940s the Yankees beat the Dodgers in the World Series three times with three different managers:
1941 Joe McCarthy beat Leo Durocher
1947 Bucky Harris beat Burt Shotton
1949 Casey Stengel beat Burt Shotton.

The Yanks and Dodgers would meet again in 1952, 1953, 1955, 1956.