Tor uses volunteer relay nodes with no financial stake in honest operation. A relay operator who wants to attack the network simply sets up a node and waits for circuits to route through it. The Tor Project implements quality controls through relay flags and bandwidth measurement, but the barrier to entry for malicious relay operation is low in terms of financial cost.
Lokinet uses service nodes that must stake Oxen cryptocurrency (currently several thousand dollars worth) to participate in routing. A malicious node operator caught behaving dishonestly loses their stake. This economic disincentive raises the cost of Sybil attacks significantly compared to Tor's free-to-enter relay model.
The limitation of staked node models is that wealthier adversaries (nation-states, well-funded criminals) can run many staked nodes by absorbing the financial cost. Tor's larger network (6,000+ relays) provides more diversity than Lokinet's smaller service node network (1,500-2,000 nodes). The economic security model and the diversity model have different strengths against different adversary classes.