Ahochan: As far as the length discrepency - won't matter. The difference in electrical properties of the two different lengths is not significant. Sure there will be some difference in all three electrical values because they each depend on the length. But, the effect of these differences is unimportant in your application. The practical difference matters no more than, for example, whether the temperature in your refrigerator is 34 degrees F as opposed to 34.005 degrees F.
As far as connectors at the end of cables - does not really matter either. One can have problems with the connection between the cable and the connector and some banannas can result in poor connection at the male - female connection. You do eliminate these potential problems by going with bare wire. Of course making good crimp or solder connections and unplugging and plugging the banannas every six months also ensures no problems. But, there is no significant advantage to using spade or bananna termination - so no reason to spend the money if you are on a very tight budget.
As far as connectors at the end of cables - does not really matter either. One can have problems with the connection between the cable and the connector and some banannas can result in poor connection at the male - female connection. You do eliminate these potential problems by going with bare wire. Of course making good crimp or solder connections and unplugging and plugging the banannas every six months also ensures no problems. But, there is no significant advantage to using spade or bananna termination - so no reason to spend the money if you are on a very tight budget.