As I said on the other thread and some others have said here, I'd rule out the 11hp C30.
The ad for the boat with the larger engine is a bit sparse. You might email the seller and ask about pressure water, water heater, etc. You may find the boat already has these features. My C30 does, but it's a '95 MKIII so there are some differences.
What struck me about the Pearson yawl is its narrow beam. Though it's a 35 footer it appears to have less interior space than my Catalina 30. In particular I noticed how thin the seats are on the salon cushions. If you're spending any amount of time aboard you'll need comfortable places to curl up with a book or watch TV. This boat just doesn't look all that comfortable as a live aboard (for me).
The Catalina 30 also has a large cockpit where you can stretch out. This boat doesn't.
The alcohol stove would worry me. But you can swap in a propane stove for around $1k, and probably half that if you can find one used.
95 Catalina 30 Island Time
“Only two sailors, in my experience, never ran aground. One never left port and the other was an atrocious liar" - Don Bamford