Charles Barkley had the best PER by a small forward when playing 20+ games, with a 27.1 rating.

Interpreted as:

sf most per with 20 or more games

	NAME	PER	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
1	Charles Barkley C. Barkley	27.1	79	39.1	25.2	11.5	3.9	1.9	0.6	8.9	14.9	60.0	0.3	1.2	21.7	7.1	9.4	74.9	66.1	4.6	6.9	3.1	3,085	1,989	909	307	148	50	243	250
2	LeBron James L. James	27.1	1,285	37.8	27.5	7.6	7.6	1.5	0.8	10.0	19.9	50.5	1.7	4.9	34.7	5.7	7.7	73.6	59.0	1.2	6.5	3.5	48,637	35,279	9,810	9,730	1,917	974	4,534	2,326	+6116
3	Kevin Durant K. Durant	25.7	981	36.9	27.8	7.2	4.5	1.1	1.1	9.5	18.9	50.6	2.0	5.1	39.1	6.7	7.6	88.5	62.6	0.7	6.6	3.2	36,203	27,300	7,106	4,453	1,045	1,121	3,131	1,911	+5422
4	Leonard Miller L. Miller	24.3	30	2.8	1.6	1.0	0.3	0.1	0.1	0.6	1.2	54.3	0.1	0.3	20.0	0.3	0.3	90.0	62.2	0.3	0.8	0.1	84	49	31	8	4	2	3	7	-4
5	Zion Williamson Z. Williamson	24	24	27.8	22.5	6.3	2.1	0.7	0.4	8.8	15.0	58.3	0.3	0.6	42.9	4.8	7.4	64.0	61.6	2.7	3.6	2.5	668	540	150	50	16	9	59	42	+62
6	Larry Bird L. Bird	23.9	792	38.5	24.9	10.1	6.3	1.8	0.8	9.8	19.6	50.0	0.7	1.8	37.1	4.6	5.2	88.4	56.7	2.1	8.0	3.2	30,504	19,719	8,031	4,958	1,406	664	2,504	2,079
7	Kawhi Leonard K. Leonard	23.2	733	31.8	20.1	6.4	3.1	1.7	0.6	7.3	14.6	49.9	1.6	4.1	39.2	3.9	4.5	86.0	60.4	1.2	5.2	1.7	23,281	14,733	4,662	2,236	1,255	471	1,212	1,225	+4597
8	Jimmy Butler III J. Butler III	22.9	569	32.8	19.2	5.6	4.9	1.6	0.4	6.2	12.8	48.3	0.7	2.2	33.0	6.1	7.2	85.2	60.2	1.9	3.8	1.7	18,689	10,904	3,210	2,762	922	235	950	760	+1625
9	Julius Erving J. Erving	22.8	702	34.6	22.8	7.1	4.0	1.9	1.6	9.0	17.6	51.2	0.0	0.2	25.3	4.8	6.2	77.4	56.2	2.5	4.5	3.1	24,285	16,019	4,967	2,785	1,319	1,117	1,951	1,953
10	Elgin Baylor E. Baylor	22.7	846	40.0	27.4	13.5	4.3			10.3	23.8	43.1				6.8	8.7	78.0	49.4				33,863	23,149	11,463	3,650				2,596
11	Michael Redd M. Redd	22.3	53	38.4	26.7	3.7	2.3	1.2	0.2	9.0	19.3	46.5	2.2	5.8	38.2	6.5	7.8	82.9	58.6	0.8	2.9	2.3	2,036	1,416	196	124	63	9	122	78	+1
12	Stephen Graham S. Graham	21.9	22	5.8	4.0	1.0	0.4	0.2	0.0	1.5	2.6	58.6	0.3	0.6	50.0	0.5	0.7	75.0	66.9	0.2	0.8	0.5	128	87	22	9	4	1	10	14	+10
13	Dominique Wilkins D. Wilkins	21.6	1,074	35.5	24.8	6.7	2.5	1.3	0.6	9.3	20.1	46.1	0.7	2.1	31.9	5.6	6.9	81.1	53.6	2.7	3.9	2.5	38,113	26,668	7,169	2,677	1,378	642	2,669	2,061	-392
14	Ron Bonham R. Bonham	21.6	37	10.0	7.4	2.1	0.5			2.5	5.9	41.4				2.5	3.0	82.1	50.9				369	274	78	19				33
15	Adrian Dantley A. Dantley	21.5	955	35.8	24.3	5.7	3.0	1.0	0.2	8.6	15.8	54.0	0.0	0.1	17.1	7.2	8.7	81.8	61.7	2.3	3.4	2.9	34,151	23,177	5,455	2,830	944	150	2,503	2,550
16	Travis Grant T. Grant	21.4	36	4.4	3.6	1.5	0.2	0.0	0.0	1.4	3.3	43.3				0.7	0.8	82.8	48.2	0.0	0.3		159	128	53	7	0	0		20
17	George Gervin G. Gervin	21.4	82	33.0	23.1	5.5	2.9	1.3	1.3	8.9	16.3	54.4				5.4	6.5	83.3	60.4	1.6	3.9		2,705	1,895	454	238	105	104		286
18	Paul Reed P. Reed	21.3	26	6.8	3.4	2.3	0.5	0.4	0.5	1.6	3.0	53.8	0.0	0.2	0.0	0.2	0.3	50.0	54.0	1.2	1.2	0.5	177	88	61	12	10	13	12	29	+36
19	Walter Davis W. Davis	21.1	350	27.7	20.3	3.9	3.3	1.3	0.2	8.3	15.6	52.9	0.1	0.3	16.7	3.8	4.5	84.2	57.8	1.2	2.8	2.8	9,712	7,104	1,378	1,172	462	75	965	923
20	John Drew J. Drew	20.9	639	30.6	21.2	7.3	1.6	1.4	0.3	7.6	16.2	47.1	0.0	0.1	12.9	6.0	8.0	74.4	53.8	3.1	4.2	2.8	19,568	13,553	4,668	1,054	894	189	1,168	2,368
21	Vince Carter V. Carter	20.7	571	31.6	19.0	4.7	3.2	1.1	0.7	6.9	15.4	44.7	1.5	3.9	37.7	3.7	4.7	78.8	54.3	1.3	3.4	1.8	18,029	10,831	2,683	1,824	629	413	1,025	1,541	+850
22	George Yardley G. Yardley	20.6	472	33.4	19.2	8.9	1.7			6.8	16.0	42.2				5.7	7.3	78.0	49.9				15,767	9,063	4,220	815				1,426
23	Rudy Tomjanovich R. Tomjanovich	20.5	80	40.3	24.5	9.0	3.1	1.1	0.8	9.9	18.4	53.6				4.8	5.7	84.8	58.7	2.9	6.1		3,227	1,961	717	250	89	66		230
24	Tom Gugliotta T. Gugliotta	20.5	41	38.6	20.1	8.7	4.1	1.5	0.5	7.8	15.5	50.2	0.0	0.4	11.8	4.5	5.4	82.1	56.1	2.6	6.1	2.7	1,582	823	356	167	61	22	109	102	+84
25	Tracy McGrady T. McGrady	20.4	320	29.4	15.9	5.4	3.6	1.1	1.0	5.8	13.5	43.2	0.8	2.5	32.4	3.4	4.6	74.0	51.2	1.4	4.0	1.9	9,405	5,087	1,715	1,144	349	320	600	577	+209