If you answer Lebron without really thinking you are probably a young fan. Larry Bird was a legend.
The answer depends on how many years you want to build your team for.
In the case that it will be for 1 years then Larry Bird 1984–1985 season (his best) was better than Lebron James 2007–2008 season (arguably his best: I tried the same analysis with different years and come to the same conclusion). Let’s look at the numbers:
LB: 28.7 pts, 10.5 reb, 6.6 assist, 1.6 steals, 1.2 blks, 88.2 FT%, 42.7 3P%, 52.2 FG%
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LJ: 30.0 pts, 7.9 reb, 7.2 assist, 1.8 steals, 1.1 blks , 71.2 FT%, 31.5 3P%, 48.5 FG%
LB and LJ have very similar stats in pts, reb, assist, blocks and steals but LB is much more efficient in the process especially from the 3 point line and from the free throw line.
If by prime you mean between the age of 23 and 31 then the statistics are in favour of LB as well (again the efficiency argument, FT% is killing lebron’s legacy):
LB: 25.0 pts, 10.2 reb, 6.6 assist, 1.8 steals, 0.8 blks, 87.9 FT%, 37.7 3P%, 50.3 FG%
LJ: 27.4 pts, 7.4 reb, 7.1 assist, 1.6 steals, 0.8 blks , 74.9 FT%, 34.5 3P%, 51.6 FG%
If you want to have your team for more than a decade (arguably no prime years anymore) I would say LJ would then be your man as he has been having a greater longevity.
To sum it up:
- if for one year go for Bird,
- if between 23 and 31 go for Bird
- if you want to go for more than a decade go with Lebron.
Below for illustration only ..