Read that sucrose has very low gi compared to glucose.when sugar breaks in body,only glucose gets absorbed to bloodstream.so sucrose better sweetener?

Better = ?: Glycemic index (GI) is how fast a food raises your blood sugar, i.e. the glucose level in your blood. Sucrose has a lower GI than glucose, AND sucrose tastes sweeter than glucose. Also, higher GI is generally considered less healthy. So, I’d have to agree that sucrose is a “better” sweetener than glucose. Note: sucrose is still pretty bad, from a GI standpoint, just not as bad as glucose.