You're not factoring 2 things which are critically important: Negotiating price and how long you intend to live there.
The seller for the older condo may be asking $30K less, but every realtor working with a buyer knows this price is negotiable. It's very easy to review the comparables and see if the seller can come down in price. It may be the asking price is what the current market is but it doesn't hurt to negotiate.
As for the new condo - is this from a builder or an individual seller? Builders who have new construction will NEVER negotiate on price. They need to make a profit + they don't want to set a trend by lowering a price for 1 home when they need to sell other homes for a higher price.
If the new condo is from an individual seller, find out if this seller bought it new from a builder. The issue is when buyers purchase brand new construction, then unfortunately need to sell within the first 4 years, these owners will lose money because once they move in, their "brand new" home is now being compared to older homes because they cannot sell it as a "brand new" condo anymore. These owners insist their condo is worth what they paid the builder for it - no it's not. It's an emotional frustrating experience that these sellers need to price their "new" condo lower and not what they paid for it. This means, as a buyer - you can negotiate for a lower price BUT if the seller bought it from a builder, be prepared that the seller will need to pay the difference on the loan they owe money and it may be difficult for the seller to sell their "brand new" condo at a loss. It typically takes about 5 years for brand new construction to catch up with older homes and gain equity.