Mark, what reason would there be to specifically avoid stopping at either of these places? They both seem like perfectly legitimate stopping places to me. My gut reaction (without any sources) is that it makes absolutely no difference. I also have no objections to Jay's suggestion for a hosafa, although I don't see any compelling reason to make one. My local Chabad shul --- don't know whether this is universal Chabad minhag --- has a policy to NEVER make any hosafot. They adhere to this policy even when lots of people insist on having an aliyah on a certain Shabbat --- I believe (but am not certain) that it's the Shabbat before the Rebbe's yahrtzeit. On that Shabbat, they have multiple leinings in different rooms, restricted to exactly 7 aliyot in each room.
There is a case where different xumashim disagree about the stopping point for an aliyah based on a difference of opinion about whether one of the stopping points is "legal". In Parashat B"reishit, the last pasuq of xamishi is listed in different xumashim as either 4:22 or 4:26. According to some m"farshim, 4:26 represents the start of avoda zara in the world, which would make it a davar ra` at which it would be inappropriate to stop. Other m"farshim interpret this pasuq differently and would (presumably) have no objections to stopping there. IMHO, the choice over there is clear --- since there's a difference of opinion about whether 4:26 is appropriate based on its content, and since the only objections to 4:22 are based on minhag (not content), why "take a chance" on 4:26? In one shul that I davened at for many years, they stopped at 4:26 in the early minyan because the gabbai always followed the Qoren xumash, but the main minyan (where the rabbi davened) stopped at 4:22 --- and I'm not even sure that the rabbi knew that the two minyanim in his shul were not adhering to the same practice.