Its the type of rice but also how it's cooked and it's not totally straightforward.
An Uncle Bens Jasmine rice pouch has a fairly low gi, jasmine rice cooked in a rice cooker has a gi higher than glucose.
The glycemic index data base for rice has many records.
The lowest gis are for certain rices from Bangladesh, a Sainsburys Basmati(I don't think there are anyother 'own brands'from UK on the data base) , some brown rices and some of the Uncle Bens precooked pouches of mixed grains produced in the US.( perhaps because the method of processing causes some of the carb to become resistant?). These have gis of less than 50.
This one : Long grain rice quick-cooking variety, white, pre-cooked, microwaved 2 min (Express Rice, plain, Uncle Ben's, Masterfoods, UK) has a gi 52
Rices like Arborio (short grain used for risotto ) have gis of around 69 but so does Sainsburys easycook basmati.
Rice(even Basmati or wholegrain) cooked for a long time, or cooked in a lot of water can have a gi in the 70s or higher
The highest gis at over 100 are for Jasmine (long grain) rice cooked in a rice cooker and an unnamed boiled white rice.
The moral is choose Basmati or wholegrain or a mixture (I like one with basmati, brown and wild but don't use a precooked variety), cook it in the minimum of water, don't cook it to death! test the results on yourself. (if you have the strips)