Which behaviour is hashkafically superior?
Avraham - Sur Mei'ra 25% (2)
Yitzchak - Aseh Tov 13% (1)
Neither choice is inherently the better one. My specific response would depend on
the personality of the individuals and the circumstances 25% (2)
Both choices are equally lacking 37% (3)
1) It may be interesting to note that the Chazon Ish in Emunah u'Bitachon favours sur mei'ra over aseh tov but whether his words on the subject apply in this case could still be a matter of debate. He was speaking developmentally that the process of sur mei'ra may have a greater long term effect on an individual than a promotion of aseh tov. The fact is, though, that both, in a vacuum, are problematic in terms of expressions of Torah commitment. In terms of determining a first step taking someone further on a path of Torah, the answer may still be that it depends on the individual. (RBH)
2) Imho Yitzchaq has chosen to own mitzvat sukkah and to honour it. His failings AIVI are all too human. He is at worst mumar letei'avon, while aiming to elevate himself spiritually. Avraham is avoiding evil, but avoiding living the Torah. He is like the one who fasts on Yom Kippur while sleeping in bed, technically compliying but failing to grow. He is too inert, too much into avoidance. Hashkafically means to me "heart level". Avraham might be technically superior, but on the rachmana libba ba'ei I see Yitzchaq of putting more heart and soul into his avodah.Eventually, Yitzchaq may outgrow his lazy indulgences, Avraham "ain't going nowhere" it seems. (My 2 cents RRW)