I've found lots of little bugs in the Siglent UI. After capturing a sequence of I2C transactions I can scroll through them on the History List popup but the index number and time displayed at the bottom are incorrect. I've had the I2C SDA threshold change to 13.0V a couple of times while not in the Trigger menu at all. Also there are some incorrect messages (like misidentifying a differential probe as a current probe). This stuff is pretty minor but a little disappointing for a product released in 2021 that's had 7 firmware updates (my demo unit has the latest version).
The Lecroy UI just overall looks nicer and is functionally better with respect to serial decoding.
I've had the Siglent lock up a couple of times and require a reboot - happened when I was trying to do a sequence capture, but I haven't been able to reproduce it.
The Siglent feels slightly more responsive in terms of menus opening and closing. I find the Siglent UI somewhat more efficient by having most of the menus pop up in a strip on the right side of the screen. The Lecroy opens a strip at the bottom that requires more hand motion to make changes.
The big 1280x800 screen on both scopes is great. Would be hard to go back to a smaller screen.
The Lecroy can get it's date and time from the internet... the Siglent cannot.
I don't have a siggen suitable for measuring bandwidth, but I have one of the Bodnar pulsers and made some measurements with that:
Rise time BW BW
(ps) (BW*RT=0.35) (BW*RT=0.45)
MHz MHz
222.0 1576 2027 SDS6204A + SAP2500D, probing unused output of driver on Bodnar pulser
253.0 1383 1778 SDS6204A, pulser plugged into scope, normal acq
369.0 948 1219 SDS6204A, pulser plugged into scope, hi-res +1bit mode
430.0 814 1046 4054HD, pulser plugged into scope
668.0 524 673 SDS6204A, pulser plugged into scope, hi-res +2bit mode
My pulser is an SMA output so I have a couple of adapters to convert to BNC and that may be costing my a little bandwidth.
This 4054HD is spec'd at 500MHz, but I wonder if there's actually any difference between it and the 4104HD (which is spec'd at 1GHz). Or maybe Lecroy just specs BW really conservatively and the 4104HD is actually more like 1.5-2GHz. With the 5Gsps converters, seems like Lecroy could offer something closer to 2GHz.