I have both companies products. My Alltek LDA had a couple of traces burn up and disappear. The Alltek guarantee is that you pay shipping both ways and your board will be repaired. If it cannot be repaired, then you can buy a replacement for $50.00. Alltek was able to repair my LDA by soldering in a couple of jumper wires on the back. The interesting thing about this repair is that Alltek used some jumper wire that was barely bigger than spider web ( I should post of pic of it).
For me, one big advantage with the Alltek MPU is that it can be configured for any of my Sterns. So, say if I am having problems with Seawitch or Big Game, or Catacomb, I can use one MPU for troubleshooting across all 3 pins just by moving some DIP switches. ( If you are buying tools for your pinball repair toolbox, consider getting an Alltek MPU to use as troubleshooting tool since it can be configured to run ALL of the classic Sterns and many many Bally pins of the era).
I like my Weebly boards. I had a couple of transistor (SCRs? ) get fried on my SDU. Weebly offered to repair it but I would have incurred shipping charges. I was able to locate the transistors I needed on Ebay for around $5.00 shipped. When they arrived I made the repair.
The big advantage with the Weebly MPUs is that you can install all of these modified ROMs for the modified rulesets that are being made for these classic Sterns. I am going to be making changes to my Seawitch rules so a Weebly MPU is in its future.
If you are going to install some low voltage UNO displays, you can buy a Weebly board for a discount price that is low voltage only.
I have also assembled some Weebly rectifier boards. They are exceptional with their nice wide traces and huge diodes to replicate the bridge rectifiers.
Both brands each have their advantages. Just figure out what properties you value you more.