Sir, i respect your opinion, but 1.5 is much better a deal.
You miss great features in 1.3 variant.
One, the display panel, in this day and age a car without back camera and screen is not acceptable at all. Then again you can mirror link google maps. You also get 6 speakers.
Two, smart entry... why use key when u have the smart option, i think due to this single factor it would be impossible to sell your 1.3 Ativ.
The interior feel is altogether different in 1.5, the 1.3 variant has painted door knobs while 1.5 has chrome plated, similary gear knob is quite simplistic in 1.3
1.5 has further been blessed with Multi Information Display which single handedly knocks out the 1.3 variant
I suggest that if you don't have a financial constraint, buy 1.5 ativ.
1.3 versions lacks the basic needs of today, i.e. you add that after market and your warranty gets void... with the sort of competition coming it would be difficult to sell the stripped variants.
1.3 ativv may also be not as good on fuel average as the 1.5 variant. Then again on motorway you will miss the sports mode and eco mode on congested road...
I would suggest, rethink