Giant Trance Sizing advice

Hi,
I’ve posted before regarding a friends giant trance SX 2014 size medium. Looking at the size chart, I’m 5’7″ with 30″ inseam and chart says I should be in small but how difference is it going to make if I go for medium? Is the chart is just a guideline or true sizing?
Here’s the spec of the bike
https://www.giant-bicycles.com/us/trance-sx-27dot5-2014
https://www.rutlandcycling.com/150622/p ... -bike.aspx
I’ve posted before regarding a friends giant trance SX 2014 size medium. Looking at the size chart, I’m 5’7″ with 30″ inseam and chart says I should be in small but how difference is it going to make if I go for medium? Is the chart is just a guideline or true sizing?
Here’s the spec of the bike
https://www.giant-bicycles.com/us/trance-sx-27dot5-2014
https://www.rutlandcycling.com/150622/p ... -bike.aspx
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And it all promised so so much”
Giant Trance 2 27.5 2016 ¦ Bird Zero Mk1 ¦ Giant Revolt Advanced 2 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
I'm 5'6" with 29" inseam I ride a medium Trance and find it very comfortable.
I tried a small Trance and found it rather cramped.
I was surprised that the medium was such a good fit because all of my other bikes have been small.
As has been previously said the best way to find out is try it on a decent ride.