You cannot compare perpetuals to fixed resets.
Don't see why not. You trade off upside potential against downside protection.
The new reset issues bought at par offer next to no upside (unless the market mistakenly forgets the present value of the capital loss when called. Given the assumption that spreads (not interest rates) will fall, they offer very little downside risk, because they will be called.
The pre-existing perpetuals trading at a discount to par value, offer the same current yield. Assuming a reduction in interest rates (not spreads) they will give you upside capital gains. I don't think yields will ever end up as low as what they were issued at, but there is still upside room left.
Certainly the pre-existing issues were the better purchase in December when yields were 9-10%. Now the yields are only 7-8%. About a 30% move up.