YBR is manufactured locally whereas the CB150F is imported.
YBR's spares will be cheaper and its price to performance ratio is unbeatable whereas with the CBF; you're paying the extra money not for the quality; but for the import tax.
As for engine displacement; I really don't think mere 25cc displacement advantage makes the CBF a rocketship compared to the YBR. They both are VERY comparable bikes in terms of performance and neither is going to flat-out beat the other. Trust me!
And just so you know; YBR may have 25 less cubes but it has noticeably higher 10.0:1 compression ratio; compared to CBF's 9.0:1. What does it means, you ask?
Well, it means YBR's engine has tighter tolerance than CBF's engine which means it has better build quality, better thermal efficiency and makes more power per cubic centimeter than an engine with a 9.0:1 compression ratio, at least on paper.
I don't think the CBF150 is worth the extra 50 grands but it's a free world so buy whatever you like.
Your money, your ride, eh?
So... Good Luck!
And do invest in a good quality helmet. Contrary to popular local beliefs; our brains are priceless and it's our duty to show them some respect and give them some protection!