it depends on your trading style but essentially have a read on the forum there are some good articles.
Tick charts aim to condense the display to chart only changes in the price action, effectively filtering out sideways movement by condensing those times, for example if you have an over night session where price didn't move much you'd only get a few bars for this on the tick chart, where-as on the time chart the bards are equally spaced throughout the 24 hour period. Some people prefer this as time is taken out of analysis concentrating on price. On the contrary side you'll get to see different patterns and setup in the time based charts that are sometimes helpful.
As with these things nothing is better or worse than the other, it wholly depends on how you use and apply each type in your analysis.
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