Originally Posted by
soyabean
The downside is that you may not find the right for the others, like gear#4 minght be too easy yet gear #5 too hard to use.
No. OP is comparing two Shimano 7-speed freewheels. Comparing both versions, the first 6 cogs (14T, 16T, 18T, 20T, 22T, and 24T) are exactly the same; they only differ as to the 7th cog (28T vs. 34T).
SHIMANO TOURNEY TZ Multiple Freewheel 3x7-speed | SHIMANO BIKE-EU
So, by choosing the freewheel with the bigger 7th cog, OP will get an easier bailout gear but a slower shift thereto because of the larger gap. OP may also need a longer chain.