The following might be helpful. Ratings on the same scale (RPRs)
Baracouda 18 wins from 27 starts (hurdles) 66.6% strike rate
Best ratings: RPR 176 three times, 175 three times
Big Bucks 14 wins from 25 starts (hurdles) 56% strike rate
Best ratings: RPR 178 once, 176 twice, 174 once
Limestone Lad 29 wins from 47 starts (hurdles) 61% strike rate
Best ratings: RPR 176 twice, 174 three times.
Iris’s Gift 8 wins from 11 starts (hurdles) 72.7% strike rate
Best ratings: RPR 176 once, 173 once
Inglis Drever 13 wins from 23 starts (hurdles) 56.5%
Best ratings: RPR 174 once
Big Bucks has run to the best single rating (178) on RPRs, but Baracouda’s concentration of best ratings is better (six times at 175 or better, as opposed to three times for Big Bucks, from a similar number of starts over hurdles of 27/25).
Iris’s Gift’s strike rate is best at over 72% but from a much smaller number of starts than the others (just 11). Baracouda’s strike rate is a full 10% better than Big Bucks or Inglis Drever from a similar number of starts (27/25/23).
Limestone Lad has done fabulously well (it might be argued better than Big Bucks), but overall in weaker races.
There is clearly not much in it between them. At their best Baracouda and Big Bucks look the best in that they are able to run to the highest ratings more consistently at the top level.
Both Baracouda and Big Bucks give the impression of being better than their best ratings.
For me Baracouda gets the vote with Big Bucks a close second (although Big Bucks isn’t finished yet).
However, going back to the title of this thread it appears that gifted as they are none of these are so superior as to warrant being described as an Arkle of their division. At the moment if you had to pick one it would be Baracouda.