ABB Fully automatic star delta starter VS Siemens ditto

Dear Madam/Sir We used above both type of starters 25HP in public health engineering.Both manufacturers are high esteemed.But unfortunately siemens starters can not run properly (2 No's) and starts problem very beginning and at last we was bound to replace 2 Siemens starters by 2 ABB starters.Previous two and current two ABB starters are running very well.We used SIEMENS products earlier to huge quantities.But my latest experience is surprising.