He also never played in a top league, no disprespect to the resident francois. Becks scored more clutch goals particularly on the international stage; I cannot remember a single of Juninho's without looking it up on youtube.
The English league wouldn't have been considered a top league for a lot of Beckham's time by the standards of how most fans look at things over the last generation or so.
Look at the european performance coefficients of his time there, it's only during the early 00s that the league starts to reestablish itself near the top:
95 = 5
96 = 7
97 = 7
98 = 6
99 = 6
00 = 5
01 = 3
02 = 3
03 = 3
French league during Juninho's time.
01 = 5
02 = 5
03 = 5
04 = 5
05 = 4
06 = 4
07 = 4
08 = 4
09 = 5
I know coefficients aren't everything to a league strength, but they give an accurate enough picture of the overall quality of teams competing in european competition when comparing leagues with 5/6 average entrants every year, though it's often actually of benefit to smaller leagues to only have one consistent good team that builds a good seeding, rather than more variety. Anyway, its good enough that we can say Beckham and Juninho both broadly played in second-tier leagues.