Need of ADC's for biomedical Signal processing

Hello,

I have been doing a project on PPG waveform acquisition for my final year of a bachelors degree. My signal lies in the range of around 0.1Hz to 150Hz.....What ADC's can I use in order to acquire a perfect signal with less loss of data. Please suggest me whether I need to go for precision ADC's or High Speed ADC's?

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