I believe it comes down to what you want from your new system when's it is completed. The two you mentioned will give two completely different end states. It will be hard to find many negatives on a PID based electric system. They are tried and true and guys still are in charge of doing 90% of the work of the process. It will keep temps and move liquor/wort around and the only effort you give is some valve openings, hose changing, and button pushing.
I look at the Brewtroller system as my brew day management tool. I wanted consistency and my brew day shortened, plus I love the tech stuff.(but I am not a computer science major or a programmer) to give you an example of what the BT is capable of ill give u a typical brew day.
I load my program values in the BT the note before. It calculates strike volume,temps,ect. I start the program and it uses a volume sensor to fill the HLT to the specified volume. I then set a delay to restart the program 1.5 hours before ill get up the next morning and fill the MLT with my crushed grain.
When I wake up, I go down to the brew area to find the BT has heated the strike water, transferred over the specified amount, refilled the HLT with sparge water, and started recirculating the mash heating it thru the HERMS coil.
I stir, check the set temps and I go upstairs to have some coffee. I can monitor everything on my iPad. When it is nearly finished mashing, ill go down and set my kettle valve for sparging. I will direct the BT to start auto fly sparging. It starts transferring wort to the kettle and once it sees 1/4 gallon in the kettle it will activate the HLT pump and transfer the same amount to the MLT. It does this until the specified preboil vol is reached. I forward it to boil and I use manual boil control, meaning i set the power using percentages. The BT times and sets an alarm for each hop addition. I have set to auto recirculate the last 10 minutes to sanitize my chiller. I chill to the fermenter.
Ill go back to my first statement. What do you want from the system? If you "enjoy" the process and like to be involved, then a PID system would work great. I wanted less hands on so I felt the BY system
Was the best fit for me and it has worked out well. No matter which way you decide, be safe and stay committed as it will seem
Like a lot to take on. Good luck!