Which brand is the best for GC-MS? Thanks.

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jx2015
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Which brand is the best for GC-MS? Thanks.

Hi I would like to get some expertise advices for purchasing an advanced GC-MS/MS. I have a list shown below. Your input is highly appreciated.

1. Agilent 7000A 7000B 7000C GC-MS/MS
2. Thermo Scientific TSQ8000 Evo GC-MS/MS
3. BRUKER SCIONTQ GC-MS/MS 320GC-MS/MS
4. SHIMADZU GCMS-TQ8030