Safer is still relative. Why would roll bars be any safer unless you intend to put the car on it's roof? Keep it on the tires, dirty side down, and you'll be OK.
The power loss thing is negligible... at such low power, you're not likely to notice the difference between them... however, the 1.0 is much more fuel efficient, and if you're going to chop/lower a Metro, the 1.0 will feel something like the 1.3 does in a "normal" Metro.
The actual numerical difference is something like 12 HP between them, IIRC.
Gasoline Fumes will surely know, and probably be able to correct me on that.
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