For me I have 32 years machine shop experience...but very little electrical...so I tend to shy away from things I may not easily be able to repair...also the electric units tend to command a bit higher price, and I also enjoy the romance of open flame.
From what I have read with a little mod electronic unit Can have even finer control than a BIX burner unit....I understand the value in this....perhaps as the shows open up and I can chat with experienced steamers and the ins and outs of repairing electronic heated boilers....then I Will be comfortable making a purchase!
Speaking of electronic boilers...I made a low bid on a Jensen model #5 with electronic boiler!
I did not like that it was electronic but the cast metal base of the engine appealed to me...also it has an empire water pump accessory that I wanted....is the Jensen #5 a good engine? My bid was low as the sight Glass was gone and the boiler looked real ruff...