If you had to buy something new for an esports machine, GT1030 all the way. Or something from the used market, real GTX1050 commonly sell for around $100.
GT730 GDDR5 version has similar memory bandwidth to the GT1010, lower core count (but newer cores), probably around the same performance. But they basically don't make the good 730 anymore, so not much chance of getting one new. And quite the gamble used.
The downside of the GT1030 and likely GT1010 is also limited PCIe bandwidth. Only a 4x card, so you lose half that running at 2.0 and half again at 1.1. In that regard, some of the even older GPUs would be better. But at that point more effective to pick up an AMD APU.