Is a mechanical machine is more robust to an electronic machine?
There is no difference between mechanics and electronics as regards durability. Everything depends on the quality of the product. A sewing machine that costs € 200/300 € will probably be a good quality product, whether electronic or mechanical. Many are puzzled buyer noting that some sewing machines are produced in China or Taiwan. This does not necessarily mean that the product is poor: while the expense of producing house and checks that are made on the machines before the sale. The big brands make very strict controls on their products.