This is user dependent and it comes down to how your blood pressure reacts to stims. I would not advise using a stim pre workout, but rather a non stim with nootropics to help with focus and mental clarity.
For the non stim product, I would suggest the newly launched VasoMax. It contains 810 mg of nitrates, which is a very high amount, and 3 grams of glycerol. Users report good pumps from 1-2 grams of glycerol. Couple 3 grams with 810 mg of nitrates and you will appreciate the pumps.
For nootropics, this is my protocol and I love it. I do this every hypertrophy day and I feel just fine.
1 Scoop VasoMax
1-2 grams of tyrosine
300-600 mg of Alpha GPC
1-2 grams of ALCAR
100-200 mcg of Huperzine A