Using the correct tools always gives you a better finish. Especially for the soil pipe. Look how nice neat the cut hole is.
Box ends look great when they are straight and neat. Also using polypins to fix them in place is always the best solution. Not a good idea to use silicon to fix the fascia corners in place either. They eventually drop off. Leaving it looking unsightly. Plus silicon gets dirty over a period of time, making it look like a poor job.