From my experince spray is better, than bottle and there is one very important reason. Tru-Oil in spray gets deeper inside wallnut and sets off wallnut colors and layers just fine.
I began to use Tru-Oil since ~2000 and I'd say it's one of the most long lasting finishes for woods.
My personal goose call made from wallnut with TO finish is like new still, but it's heavy duty thing and spends his life in wet conditions mostly and for allmost 10 years now.

Geno.