BA, OBP, SLG: which tells you more?

In 2015 142 batters "qualified for league batting title" ranging:

Rk	Player	BA	OBP	SLG	OPS	OPS+	Year	Age	Tm	Lg	G	PA	AB	R	H	2B	3B	HR	RBI	BB	IBB	SO	HBP	SH	SF	GDP	SB	CS	Pos
1	Miguel Cabrera	.338	.440	.534	.974	170	2015	32	DET	AL	119	511	429	64	145	28	1	18	76	77	15	82	3	0	2	19	1	1	*3D/H
2	Dee Gordon	.333	.359	.418	.776	114	2015	27	MIA	NL	145	653	615	88	205	24	8	4	46	25	2	91	2	6	5	6	58	20	*4/H
3	Bryce Harper	.330	.460	.649	1.109	195	2015	22	WSN	NL	153	654	521	118	172	38	1	42	99	124	15	131	5	0	4	15	6	4	*98/D
4	Paul Goldschmidt	.321	.435	.570	1.005	170	2015	27	ARI	NL	159	695	567	103	182	38	2	33	110	118	29	151	2	0	7	16	21	5	*3/DH
5	Xander Bogaerts	.320	.355	.421	.776	108	2015	22	BOS	AL	156	654	613	84	196	35	3	7	81	32	1	101	3	3	3	16	10	2	*6/H
6	Buster Posey	.318	.379	.470	.849	135	2015	28	SFG	NL	150	623	557	74	177	28	0	19	95	56	10	52	3	0	7	17	2	0	*23/HD

138	Brandon Moss	.226	.304	.407	.711	90	2015	31	TOT	ML	145	526	469	47	106	24	2	19	58	49	4	148	5	0	3	12	0	1	*93H7/D
139	Jay Bruce	.226	.294	.434	.729	97	2015	28	CIN	NL	157	649	580	72	131	35	4	26	87	58	8	145	2	0	9	10	9	5	*9/HD
140	Logan Morrison	.225	.302	.383	.685	92	2015	27	SEA	AL	146	511	457	47	103	15	3	17	54	47	5	81	4	1	2	7	8	4	*3H/97D
141	Jimmy Rollins	.224	.285	.358	.643	78	2015	36	LAD	NL	144	563	517	71	116	24	3	13	41	44	0	86	0	1	1	12	12	8	*6H
142	Joc Pederson	.210	.346	.417	.763	112	2015	23	LAD	NL	151	585	480	67	101	19	1	26	54	92	6	170	9	2	2	5	4	7	*8H

Batting Average (BA) is in disrepute but of the other two meat and potatoes stats, if you could look at just one, which would it be: On Base "Percentage" (OBP) or Slugging average (SLG)? Included above are OPS (OBP + SLG) and OPS+ (adjusted for parks).

Of the 142 batters, 20 had BA at least .300. Let's see what the top 20 in the other stats would be.

OBP: .369 (21 batters)
SLG: .502 (the only batters .500 or higher)
OPS: .864
OPS+: 133 (33% above "league" average)

Joc Pederson was the anchor man in BA at .210. However, his OBP was a whopping 136 points higher (65%), number 51 of 142. That helped Pederson reach OPS+ 112, number 65 of 142; number 71 would be halfway.

That would baffle the few old timers who still cling to BA.  Here are the in OPS+ and OPS+ ranks on number 20 for each of the other stats:

BA (.300): 116 rank 50
OBP (.369): 160 (Nelson Cruz),133 ranks 6,20
SLG (.502): 135 17

Both OBP and SLG come out about the same. I'd have picked SLG. BA lags.

Nothing up my sleeves, just some understandable common sense stuff.