Which one do you have?
I keep looking at Octavia iV estate but worried about reliability especially on the DSG box and the boot is quite small for an estate due to the batteries
It depends on what you need from a load space TBH. Basically you lose the ability to drop the floor, some people never use that option, for others it's essential.
I've got an Astra PHEV Estate (not a recommendation by the way, I couldn't find an Octavia iV or Leon in budget at the time) and that retains a good number of litres of boot space in PHEV form (just over 500 IIRC). However, not being able to drop the floor means that one of the most common bits of kit I need to transport won't stand up in it so I go from being able to carry three in the boot of my old Leon TSI to just one as it needs to be laid down.
Then again that same kit won't go sideways in my colleagues new Bigster with its apparently 612L boot (which looked rather small compared to our estates) so he's in a similar position!