There are a few main aspects of a race that can affect the strategy that can be taken, and these are all inter-related. The first of these is the actual car and track combination that is used, for example a track like Aston Grand Prix with a car like the BF1 will use a lot more fuel than a combination like Aston Cadet in the MRT. As the tracks get longer, the races tend to increase in length with them, and so more pit stops are usually required.
The next aspect to think about is tyre wear. This ties in with the car and track combination, as a car such as the XFR will eat tyres for breakfast, and cars like the MRT and the GTR's seem to be lighter on the tyres. The compound of the tyre is also important, as a GTR on R4's will last well into the 30's lapwise, whereas R2's (yes I know I am going extreme here) will be mashed after 6 or 7 laps. Also, If you go for R4's be wary of what the temperature of your tyres tells you. The tyres undergo wear whatever temperature they are at, and whereas with R3's and below you can tell when a tyre is dead simply by looking at it's temperature, with R4's you can be perfectly inside the optimum temperature range, but your tyres can still be on the brink of bursting.
This also leads to another aspect involving tyre wear: the fuel load in the car. Higher fuel loads increase the weight of the car, and this in turn increases the forces on the tyres, increasing the wear that the tyre imposes, meaning that you have to pit more often for tyres. Add this to a car like the XFR, and you have a recipe for disaster.
All these aspects affect the strategy that can be taken, and so I am not going to answer the poll question, as there is no one answer.