When it comes to handicaps, top weight is supposed to be the best horse, even though the handicap system is supposed to level all the entries. This can clearly be seen in the table below with data from over the last 5 years.
Weight Rank Runners Winners Win SR P/L BF ROI BF P/L to SP ROI to SP Lay P/L BF Plc Only SR 1 6130 1822 29.72 -322.94 -5.27 -609.99 -9.95 -102.21 39.65 2 4246 1229 28.94 -171.06 -4.03 -384.12 -9.05 -129.58 36.82 3 3593 1056 29.39 9.58 0.27 -172.77 -4.81 -270.46 37.68 4 3157 895 28.35 -36.44 -1.15 -190.51 -6.03 -193.8 37.62 5 2692 708 26.3 -126.17 -4.69 -267.85 -9.95 -70.81 38.61 6 2232 607 27.2 6.61 0.3 -119.27 -5.34 -173.73 36.18 7 1714 423 24.68 -46.23 -2.7 -135.71 -7.92 -83.83 40.12 8 1343 328 24.42 8.33 0.62 -83.67 -6.23 -112.94 39.21 9 979 246 25.13 10.74 1.1 -47.65 -4.87 -86.54 38.47 10 716 139 19.41 -151.25 -21.12 -181.23 -25.31 99.99 36.4 11 546 127 23.26 11.75 2.15 -25.61 -4.69 -55.37 34.37 12 403 89 22.08 1.33 0.33 -24.51 -6.08 -33.62 39.17 13 221 49 22.17 -2.17 -0.98 -14.65 -6.63 -15.37 33.14 14 167 25 14.97 -51.12 -30.61 -57.42 -34.38 39.24 31.69 15 102 18 17.65 -6.99 -6.85 -14.01 -13.74 -1.26 44.05 16 58 5 8.62 -29.82 -51.42 -31.25 -53.88 25.95 45.28 17 44 10 22.73 -5.82 -13.23 -8.38 -19.03 2.64 32.35 18 25 7 28 15.01 60.06 10.5 42 -17.65 44.44 19 12 4 33.33 14.37 119.79 12 100 -15.95 37.5 20 8 2 25 2.02 25.3 1.75 21.88 -2.75 16.67 21 3 1 33.33 6.46 215.2 5.5 183.33 -7 0 22 4 0 0 -4 -100 -4 -100 3.8 25 23 1 1 100 4.94 494 4.5 450 -5.2 0 24 2 0 0 -2 -100 -2 -100 1.9 50 25 3 2 66.67 11.35 378.38 11.5 383.33 -12.05 0 30 2 1 50 3.9 195.12 3.5 175 -4.21 0