Round to whatever non-zero digit is farthest to the left.
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"Round feet" is not a common unit of measurement; please explain what you mean by "round feet".
-- None of those words relates to "precise". -- "Accuracy" relates to "reliable". -- "Precision" and "accuracy" are two different things. -- "Precise" does not mean "reliable".
Unfortunately, there is not a simple answer: it depends on what you mean by "more precise". Both have three significant figures and to that extend they are equally precise. However, the maximum possible percentage errors in the two measurements are approximately 100*0.05/42.3 = 0.12% and 100*0.05/35.6 = 0.14%, respectively. On that basis, 42.3 ounces is more precise in relative terms. Also, the measurement units are smaller for 42.3 ounces so in absolute terms the measurement is more precise.
If you mean precise. It means to be exact. marked by exactness and accuracy of expression or detail
Certainly. Precision and accuracy do not mean quite the same thing. All measuring tools need to be recalibrated from time to time against a standard. For instance you can get a very precise reading from a micrometer or vernier gage but if it has not been correctly calibrated the reading will not be accurate.