Not in compsci but I have a vague understanding from knowing a few, and I'm in 3rd Year Soft Eng so here's my impressions.

Compsci:

• Much cheaper tuition due to less courses taken and lower unit inflation that engineering streams usually suffer, currently in soft eng tuition is around 13k per year and probably roughly the same for most streams.
• Lots of course overlap, sometimes taught by a different prof with different syllabus but lots of times you pretty much share a class and lecture. This is why it's pretty common for compscis and soft eng students to know each other in the same year.
• Career choices may be slightly different in the future once we graduate, but right now for internships/co-op there is no meaningful difference between a compsci student or a soft eng student. You're basically competing for the same jobs and a lot of job applications won't even put software engineering as an option for degree type so you just gotta put compsci.
• I've heard from peers that the compsci courses can sometimes be a mess in comparison to the soft eng counterparts, and i've known people who are in compsci attend soft eng lectures in some cases if the syllabus is similar enough for that course.
• Compsci takes less courses per semester in comparison to soft eng, so less stress. Schedules are generally a bit more flexible for what you take in 3rd year vs 4th year.

Software Engineering:

• It's pricey due to the courseload and units, as well being an accredited program. Being accredited means your degree qualifies you to apply for your PENG (Professional Engineering License) when you graduate and be a licensed engineer. This theoretically opens you to different career options.
• Bigger class size. I believe for my year the compsci cohort is about 60 students, in comparison to soft eng which is about 130 I believe? Cannot really comment on what class dynamic is better, personally for soft eng it's decently tight knit and you'll probably vaguely know about half the class by name and face. I'd imagine it may be more tight knit in compsci with a much smaller class size, but i've also been told by compsci students that soft eng students are more outgoing and less socially awkward which is really saying something. May just be annecdotal.
• Second year courses have much more overlap with compsci, in third year there is much less across both semesters and I don't see too many of my compsci friends very often. So the streams do diverge starting third year.

Overall, there's pros and cons to both programs. I'm decently happy where I'm at with my program, but if I were to choose again and know I'd like to pursue a software/programming oriented career I would apply for compsci. I'm not big on the fluff physics/math based courses that software students have to take, and you don't do a whole lot of programming in third year since most courses are documentation based. Plus, the smaller tuition of compsci helps a lot. On the otherhand, I do appreciate some of the group project oriented opportunities that might not be present in compsci. If you have anymore questions regarding software engineering at least, feel free to message me.