I've just finished an integrated masters in Chem eng and was in a similar boat to you unsure between chemistry and chem eng. With regards to job prospects a degree in chem eng lets you go into basically any manufacturing process - Pharmaceuticals, Oil&Gas, Chemicals, semiconductors, consumer products etc etc all of which require chemical engineers to design, maintain, manage safety, and improve the process. Equally many people i know finish and get jobs in finance, consulting etc.
I also enjoyed chemistry but would say that its not a massive focal point of the learning, you do a lot of mass balancing across large industrial plants where having a decent knowledge of what chemical reactions are ocurring and what products/side products are being produced is useful, but not required. Having strong maths skills and physics to an extent is more important like other comments have said as theres alot of new concepts eg laws of thermodynamics, fluid mechanics, heat transfer, equipment design etc which can be quite tricky. Lots of people struggle with these on any engineering course.
Lab time id say was around 5/6 hours every other week but theres alot of group working on design projects, obviously this differs depending on the uni you choose. In terms of optional modules i only picked in my final year and i have a few friends who went to other unis doing the same course and had similar experiences.
On your final point there is little to no crossover between chemistry and chemical engineering. Process/Chemical engineering is its own discipline and the skills/knowledge for it are relatively specific to the degree, its unlikely you'd be able to move into a process position without a chem eng degree. Or like the above commenter mentioned without a postgrad in it.