Walsh launched a scathing attack on the rival Saturday night music series last week, claiming that he hated the format and argued that it was "boring".
However, Julien has responded to the X Factor veteran's comments, claiming that the music industry would view The Voice as the more credible show.
"Well, you know Louis Walsh, he loves a bit of pantomime doesn't he. He should probably stick to that," Julien told Digital Spy.
"This show is more credible for musicians. It has four amazing coaches who have all been on this side of the industry and it is not like the other shows who have managers and people who just sell records for a living."
The former supermarket worker said: "I did this show because I was fed up of shelf-stacking. Working on a shop floor was so unfulfilling. This came along at the perfect time and the format and what it stands for makes it so much more impressive than the other talent shows."
Commenting on the criticism that the Voice coaches are too soft on the acts, he added: "At the end of the day they are not called judges, they are called coaches. You can't coach people by saying, 'You're s**t'.
"Unlike the other shows they won't say, 'You are awful, blah, blah, blah'. They do pick up on your faults, but it's not the focus."
Julien also confirmed that he has plans to team up with fellow Voice singers John James Newman and Aleks Josh and mentor Danny O'Donoghue's Script bandmate Mark Sheehan on a record in the near future.
The Voice UK semi-finals air this weekend on Saturday and Sunday with Kylie Minogue and Cheryl Cole performing on the results show.