I personally love my Janome, I have used and still own three makes but it does come down to the individual model and also what you want from a machine.
The bernette is a smaller machine not so much room between the needle and upright
7mm swig on the bernette so the decorative stitches are not so wide
Janome comes with an enhanced straight stitch due to the second plate and the needle position for straight stitch
Janome also comes with the walking foot which is called the acufeed.
It really is a different beast but of course there is a big difference in the price but don’t go for one that you will instantly regret and still be looking for the right machine.
I can only say this because I have been looking for the ultimate machine for years and have learnt at long last there isn’t one. Everyone’s likes and needs are different.
Good luck in whatever you decide, I do agree with
@Diane though if you do decide to go for the Bernette consider the Amazon one, ok you won’t get lesions or anyone to ask but it does come with a guarantee and if you don’t like it you can return it within 14 days and no questions asked.