What tonal characteristics are you looking for?
If you are looking for detail, speed, sound stage layering and separation between instruments, I would prefer the JLTI to the Graham and PS Audio (both I listened to extensively). The JLTI has way more resolution and captures much more nuances than either of these two.
I have not heard the Simaudio, but there is review of both JLTI and Simaudio LP5.3 in issue 11 of toneaudio. The review of the JLTI is much more enthusiastic and in the end the JTLI won the product of the year award.
Toneaudio Issue 11
Rene
If you are looking for detail, speed, sound stage layering and separation between instruments, I would prefer the JLTI to the Graham and PS Audio (both I listened to extensively). The JLTI has way more resolution and captures much more nuances than either of these two.
I have not heard the Simaudio, but there is review of both JLTI and Simaudio LP5.3 in issue 11 of toneaudio. The review of the JLTI is much more enthusiastic and in the end the JTLI won the product of the year award.
Toneaudio Issue 11
Rene