Hmmmm, I think I will take the hassle of going via Frankfurt.
Most defiantly not worth it!
If you were going LH F that's another thing but the hassle of going vie FRA just because some think LH J is a little better then BD, do me a favor...
It’s a 4 hour flight!!!
And as already mentioned looks like most 757's are replaced with A321's now anyway (I have 3 booking currently all operated by A321's)