Yuin PK3 IMO definitely sounds significantly better than the Tingo TG-38s. I'm actually not impressed with them at all. I let them burn in for weeks. I actually bought them because of all the favorable remarks but in the end, I guess it depends which sound signature you prefer as well. The voices are recessed, the upper end of the highs are accentuated. Reproduction of the mids can be muddled and not nearly as detailed as the PK3. Bass wise the Tingos really blow in accuracy, clarity, and amount of bass. Instruments and sounds just get lost. The PK3 just sounds more natural like you were listening to the instruments or the person in front of you. The PK3 sounds great with most every type of music thrown at it. Bass, highs and mids are impressively accurate in the price range. PK3 sounds better than many earbuds and IEM's under $100 including Klipsch S4, or the Hifiman Re-zero, I actually think the Sennheiser MX365 even sound better than the Tingo. So if you really want to save money just get those for $15. If you want a really cheap option and are ok with IEM then get the Phillips SHE-3950 for $9. I wouldn't waste the money on the Tingo's with other options out there. Besides I feel kind of silly wearing them. Actually, they sound good with Jazz even though the voices are slightly thin. Not recommended for Rock, Pop, Electronic music. I'll keep them around and use them in situations where I might break them.
, plus its the best built of my three earbud (pk1,tg38s,and kt100) I'll maybe soon get my mc5 and tc00 hopefully 
... I don't hear muddy midrange, its very natural but yesterday I got my kt100 from sidy and I. Blown away by its performance 
