Overall, Omega Centauri is brighter. The U2000 field guide lists its visual magnitude as 3.9 while 47 Tucanae is listed at 4.Ihave read elsewhere of larger differences.
The key thing is that 47 Tucanae is far more compressed so appears much brighter. In a decent sized scope, 47 is much more interesting viewing as Omega is just so spread out.
Cheers
Malcolm
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