Agilent; Thermo Fisher, PerkinElmer etc? Does the collision mode display better results than the reaction mode for multi-element analysis or are they similar in performance? Are there any problems that can arise with 90-degree deflector lens types?
This is a tough question - the answer lies in what you want from the analysis in terms of detection limit, precision of the analysis, and the range of analytes you are interested in. Pperhaps you can think on these queations and resubmit your question.
We have been running Agilent ICPMS instruments (3) for about 10 years, and have found them to be generally trouble-free while producing excellent and reproducible results (published in >100 papers). But a lot will depend on the availability and quality of your local service apparatus, so you need to assure yourself on that before considering different intstuments.