There are 2 Blue liner tapes available.
One is made by Davlyn and the other is made by Walker.
The Walker blue tape has 'Lace Front Support' printed on it, while the Davlyn doesn't, and that is the only difference between them really.
It is your choice which to go for but they both really are just the same, just marketed differently.
I hope that clears any confussion up regarding Blue Liner Tape.?