The finding: across 3,640 NFL player props available at both DraftKings and FanDuel during the 2025 season, the two books posted different lines 48% of the time. Taking the better number improved the under hit rate from 52.4% to 53.2% — about a point of return, earned by comparing two screens before betting.

That is a small number that compounds. Here is the full measurement and how to act on it.

What we measured

We captured closing lines from DraftKings and FanDuel roughly one hour before kickoff across the 2025 regular season, weeks 1 through 9. For every prop available at both books, we compared the numbers and graded both against the actual result.

| | Under hit rate | Return |

|---|---|---|

| One book (DraftKings only) | 52.4% | -1.4% |

| Higher of the two lines | 53.2% | -0.5% |

By market:

| Market | One book | Better line |

|---|---|---|

| Rushing yards | 53.5% | 54.1% |

| Receptions | 53.7% | 54.2% |

| Receiving yards | 51.0% | 52.2% |

| Passing yards | 50.2% | 51.0% |

The improvement is consistent. It shows up in every market, which is what separates a real effect from a lucky slice.

Why books disagree

Sportsbooks do not copy each other's numbers. Each one prices from its own model and then adjusts for the money it takes. Two things create the gap:

Different models. Books weight recent games, injuries and matchups differently. On a player where the inputs are ambiguous — a receiver returning from injury, a back in a new committee — the models land in different places.

Different customers. If DraftKings takes heavy action on a receiver's over, it moves that line up to balance its book. FanDuel, with different customers, may not move at all. The result is two different numbers on the same player.

Neither book is wrong. But one of them is better for you.

What half a point is actually worth

The value depends on where the half-point sits relative to likely outcomes.

Receptions: enormous. Moving a line from 4.5 to 5.5 removes an entire realistic outcome from your losing column. Reception lines are low integers, so each half-point covers a big chunk of the distribution.

Rushing and receiving yards: meaningful. Half a yard is trivial, but books often differ by 2.5 to 5 yards on these markets, which is a real shift.

Passing yards: smallest relative impact, since a 5-yard difference on a 250-yard line is 2%. Still worth taking, but the price often matters more than the number here.

Line versus price

Two rules that follow from the measurement:

How to line shop without wasting your evening

• -Two accounts is enough. The bulk of the benefit comes from comparing the two largest prop menus. Adding a third book helps at the margin.
• -Check before every bet, not after. The comparison takes ten seconds. Do it as a habit, not an occasional effort.
• -Shop the side you want. For an under, you want the highest line. For an over, the lowest. The "best" number depends on your side.
• -Watch for stale numbers. When news breaks — a starter ruled out on Sunday morning — one book often moves before the other. That gap is temporary and larger than the usual half-point.

What line shopping is not

It is not a substitute for picking the right side. If you bet unders that lose 55% of the time, getting a better number just loses slightly slower.

It is also not arbitrage. True arbitrage — betting both sides at two books for a guaranteed profit — is rare on props and gets accounts limited quickly. Line shopping simply means taking the better available number on the side you already wanted.

We do this automatically

BetBlum compares books on every NFL prop and shows one card per player and market at the best available number for the side we project — the higher line on an under, the lower on an over, then the better price when the lines match.

Start your free 48-hour trial and stop leaving half-points on the table.